52031640 has 128 divisors (see below), whose sum is σ = 164229120. Its totient is φ = 13171200.

The previous prime is 52031593. The next prime is 52031669. The reversal of 52031640 is 4613025.

It is a happy number.

It is a super-2 number, since 2×52031640² = 5414583122179200, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 264022 + ... + 264218.

It is an arithmetic number, because the mean of its divisors is an integer number (1283040).

Almost surely, 2^52031640 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 52031640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82114560).

52031640 is an abundant number, since it is smaller than the sum of its proper divisors (112197480).

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

52031640 is a wasteful number, since it uses less digits than its factorization.

52031640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 313 (or 309 counting only the distinct ones).

The product of its (nonzero) digits is 720, while the sum is 21.

The square root of 52031640 is about 7213.2960565888. The cubic root of 52031640 is about 373.3268033155.

Adding to 52031640 its reverse (4613025), we get a palindrome (56644665).

The spelling of 52031640 in words is "fifty-two million, thirty-one thousand, six hundred forty".