53131640 has 32 divisors (see below), whose sum is σ = 119789280. Its totient is φ = 21209472.

The previous prime is 53131627. The next prime is 53131651. The reversal of 53131640 is 4613135.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24854 + ... + 26906.

It is an arithmetic number, because the mean of its divisors is an integer number (3743415).

Almost surely, 2^53131640 is an apocalyptic number.

It is an amenable number.

53131640 is an abundant number, since it is smaller than the sum of its proper divisors (66657640).

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

53131640 is a wasteful number, since it uses less digits than its factorization.

53131640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2711 (or 2707 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 23.

The square root of 53131640 is about 7289.1453545666. The cubic root of 53131640 is about 375.9393104099.

Adding to 53131640 its reverse (4613135), we get a palindrome (57744775).

The spelling of 53131640 in words is "fifty-three million, one hundred thirty-one thousand, six hundred forty".