897236640 has 144 divisors (see below), whose sum is σ = 3099122208. Its totient is φ = 236348928.

The previous prime is 897236621. The next prime is 897236651. The reversal of 897236640 is 46632798.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 115767 + ... + 123273.

It is an arithmetic number, because the mean of its divisors is an integer number (21521682).

Almost surely, 2^897236640 is an apocalyptic number.

897236640 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 897236640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1549561104).

897236640 is an abundant number, since it is smaller than the sum of its proper divisors (2201885568).

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

897236640 is a wasteful number, since it uses less digits than its factorization.

897236640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7611 (or 7600 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 45.

The square root of 897236640 is about 29953.9085930367. The cubic root of 897236640 is about 964.5002253401.

The spelling of 897236640 in words is "eight hundred ninety-seven million, two hundred thirty-six thousand, six hundred forty".