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680689753 = 4357156229
BaseRepresentation
bin101000100100101…
…000000001011001
31202102211121210121
4220210220001121
52343224033003
6151313313241
722603524142
oct5044500131
91672747717
10680689753
1131a260317
1216bb65821
13ab03ac03
146658cac9
153eb5acbd
hex28928059

680689753 has 4 divisors (see below), whose sum is σ = 680850340. Its totient is φ = 680529168.

The previous prime is 680689717. The next prime is 680689781. The reversal of 680689753 is 357986086.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 357986086 = 2178993043.

It can be written as a sum of positive squares in 2 ways, for example, as 387184329 + 293505424 = 19677^2 + 17132^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2k-680689753 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 680689753.

It is not an unprimeable number, because it can be changed into a prime (680689453) 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, 73758 + ... + 82471.

It is an arithmetic number, because the mean of its divisors is an integer number (170212585).

Almost surely, 2680689753 is an apocalyptic number.

It is an amenable number.

680689753 is a deficient number, since it is larger than the sum of its proper divisors (160587).

680689753 is a wasteful number, since it uses less digits than its factorization.

680689753 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160586.

The product of its (nonzero) digits is 2177280, while the sum is 52.

The square root of 680689753 is about 26090.0316787849. The cubic root of 680689753 is about 879.6631600813.

The spelling of 680689753 in words is "six hundred eighty million, six hundred eighty-nine thousand, seven hundred fifty-three".

Divisors: 1 4357 156229 680689753