97639840 has 48 divisors (see below), whose sum is σ = 244249992. Its totient is φ = 36757504.

The previous prime is 97639793. The next prime is 97639847. The reversal of 97639840 is 4893679.

It can be written as a sum of positive squares in 4 ways, for example, as 92852496 + 4787344 = 9636^2 + 2188^2 .

It is not an unprimeable number, because it can be changed into a prime (97639847) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15229 + ... + 20668.

Almost surely, 2^97639840 is an apocalyptic number.

It is an amenable number.

97639840 is an abundant number, since it is smaller than the sum of its proper divisors (146610152).

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

97639840 is a wasteful number, since it uses less digits than its factorization.

97639840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35929 (or 35921 counting only the distinct ones).

The product of its (nonzero) digits is 326592, while the sum is 46.

The square root of 97639840 is about 9881.2873655207. The cubic root of 97639840 is about 460.4781417702.

The spelling of 97639840 in words is "ninety-seven million, six hundred thirty-nine thousand, eight hundred forty".