897904656 has 80 divisors (see below), whose sum is σ = 2811635520. Its totient is φ = 272090880.

The previous prime is 897904643. The next prime is 897904669. The reversal of 897904656 is 656409798.

897904656 is a `hidden beast` number, since 8 + 97 + 90 + 465 + 6 = 666.

It is an interprime number because it is at equal distance from previous prime (897904643) and next prime (897904669).

It is a Harshad number since it is a multiple of its sum of digits (54).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89725 + ... + 99228.

It is an arithmetic number, because the mean of its divisors is an integer number (35145444).

Almost surely, 2^897904656 is an apocalyptic number.

It is an amenable number.

897904656 is an abundant number, since it is smaller than the sum of its proper divisors (1913730864).

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

897904656 is a wasteful number, since it uses less digits than its factorization.

897904656 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 188981 (or 188969 counting only the distinct ones).

The product of its (nonzero) digits is 3265920, while the sum is 54.

The square root of 897904656 is about 29965.0572500705. The cubic root of 897904656 is about 964.7395311227.

The spelling of 897904656 in words is "eight hundred ninety-seven million, nine hundred four thousand, six hundred fifty-six".