697568256 has 264 divisors, whose sum is σ = 2513781504. Its totient is φ = 181002240.

The previous prime is 697568239. The next prime is 697568257. The reversal of 697568256 is 652865796.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (264).

It is not an unprimeable number, because it can be changed into a prime (697568257) 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, 709141 + ... + 710123.

Almost surely, 2^697568256 is an apocalyptic number.

697568256 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 697568256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1256890752).

697568256 is an abundant number, since it is smaller than the sum of its proper divisors (1816213248).

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

697568256 is a wasteful number, since it uses less digits than its factorization.

697568256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1027 (or 1006 counting only the distinct ones).

The product of its digits is 5443200, while the sum is 54.

The square root of 697568256 is about 26411.5174876416. The cubic root of 697568256 is about 886.8746396904.

The spelling of 697568256 in words is "six hundred ninety-seven million, five hundred sixty-eight thousand, two hundred fifty-six".