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257720245 = 5292167367
BaseRepresentation
bin11110101110001…
…11111110110101
3122221221112201021
433113013332311
51011434021440
641323501141
76246404656
oct1727077665
9587845637
10257720245
11122527042
12723877b1
13415166b3
142632952d
151795b84a
hexf5c7fb5

257720245 has 24 divisors (see below), whose sum is σ = 323092224. Its totient is φ = 197335488.

The previous prime is 257720233. The next prime is 257720249. The reversal of 257720245 is 542027752.

It is a happy number.

It is not a de Polignac number, because 257720245 - 29 = 257719733 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 257720245.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (257720249) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 702052 + ... + 702418.

It is an arithmetic number, because the mean of its divisors is an integer number (13462176).

Almost surely, 2257720245 is an apocalyptic number.

It is an amenable number.

257720245 is a deficient number, since it is larger than the sum of its proper divisors (65371979).

257720245 is a wasteful number, since it uses less digits than its factorization.

257720245 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 597 (or 568 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 34.

The square root of 257720245 is about 16053.6676494812. The cubic root of 257720245 is about 636.3794962621.

Adding to 257720245 its reverse (542027752), we get a palindrome (799747997).

It can be divided in two parts, 2577 and 20245, that added together give a palindrome (22822).

The spelling of 257720245 in words is "two hundred fifty-seven million, seven hundred twenty thousand, two hundred forty-five".

Divisors: 1 5 29 145 167 367 835 841 1835 4205 4843 10643 24215 53215 61289 140447 306445 308647 702235 1543235 1777381 8886905 51544049 257720245