897617640 has 32 divisors (see below), whose sum is σ = 2692853280. Its totient is φ = 239364672.

The previous prime is 897617621. The next prime is 897617653. The reversal of 897617640 is 46716798.

It is a self number, because there is not a number n which added to its sum of digits gives 897617640.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3739954 + ... + 3740193.

It is an arithmetic number, because the mean of its divisors is an integer number (84151665).

Almost surely, 2^897617640 is an apocalyptic number.

It is an amenable number.

897617640 is an abundant number, since it is smaller than the sum of its proper divisors (1795235640).

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

897617640 is a wasteful number, since it uses less digits than its factorization.

897617640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7480161 (or 7480157 counting only the distinct ones).

The product of its (nonzero) digits is 508032, while the sum is 48.

The square root of 897617640 is about 29960.2676890578. The cubic root of 897617640 is about 964.6367268929.

The spelling of 897617640 in words is "eight hundred ninety-seven million, six hundred seventeen thousand, six hundred forty".