897929640 has 96 divisors (see below), whose sum is σ = 2944230120. Its totient is φ = 237318144.

The previous prime is 897929623. The next prime is 897929651. The reversal of 897929640 is 46929798.

It can be written as a sum of positive squares in 4 ways, for example, as 702992196 + 194937444 = 26514^2 + 13962^2 .

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 23 ways as a sum of consecutive naturals, for example, 29644 + ... + 51716.

Almost surely, 2^897929640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 897929640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1472115060).

897929640 is an abundant number, since it is smaller than the sum of its proper divisors (2046300480).

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

897929640 is a wasteful number, since it uses less digits than its factorization.

897929640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22203 (or 22196 counting only the distinct ones).

The product of its (nonzero) digits is 1959552, while the sum is 54.

The square root of 897929640 is about 29965.4741327415. The cubic root of 897929640 is about 964.7484789283.

The spelling of 897929640 in words is "eight hundred ninety-seven million, nine hundred twenty-nine thousand, six hundred forty".