897696640 has 64 divisors (see below), whose sum is σ = 2198463120. Its totient is φ = 350310400.

The previous prime is 897696637. The next prime is 897696649. The reversal of 897696640 is 46696798.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (897696649) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 9135 + ... + 43345.

Almost surely, 2^897696640 is an apocalyptic number.

897696640 is a gapful number since it is divisible by the number (80) 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 897696640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1099231560).

897696640 is an abundant number, since it is smaller than the sum of its proper divisors (1300766480).

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

897696640 is a wasteful number, since it uses less digits than its factorization.

897696640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34271 (or 34259 counting only the distinct ones).

The product of its (nonzero) digits is 3919104, while the sum is 55.

The square root of 897696640 is about 29961.5860728367. The cubic root of 897696640 is about 964.6650255294.

The spelling of 897696640 in words is "eight hundred ninety-seven million, six hundred ninety-six thousand, six hundred forty".