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256216242 = 2342702707
BaseRepresentation
bin11110100010110…
…00110010110010
3122212010010121110
433101120302302
51011042404432
641231334150
76230542062
oct1721306262
9585103543
10256216242
1112169a067
1271981356
134110ac59
14260573a2
1517760dcc
hexf458cb2

256216242 has 8 divisors (see below), whose sum is σ = 512432496. Its totient is φ = 85405412.

The previous prime is 256216237. The next prime is 256216249. The reversal of 256216242 is 242612652.

It is a happy number.

256216242 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

256216242 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (256216249) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21351348 + ... + 21351359.

It is an arithmetic number, because the mean of its divisors is an integer number (64054062).

Almost surely, 2256216242 is an apocalyptic number.

256216242 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

256216242 is a wasteful number, since it uses less digits than its factorization.

256216242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42702712.

The product of its digits is 11520, while the sum is 30.

The square root of 256216242 is about 16006.7561360820. The cubic root of 256216242 is about 635.1391531689.

Adding to 256216242 its reverse (242612652), we get a palindrome (498828894).

The spelling of 256216242 in words is "two hundred fifty-six million, two hundred sixteen thousand, two hundred forty-two".

Divisors: 1 2 3 6 42702707 85405414 128108121 256216242