52331640 has 32 divisors (see below), whose sum is σ = 156995280. Its totient is φ = 13955072.

The previous prime is 52331611. The next prime is 52331651. The reversal of 52331640 is 4613325.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is a self number, because there is not a number n which added to its sum of digits gives 52331640.

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, 217929 + ... + 218168.

Almost surely, 2^52331640 is an apocalyptic number.

It is an amenable number.

52331640 is an abundant number, since it is smaller than the sum of its proper divisors (104663640).

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

52331640 is a wasteful number, since it uses less digits than its factorization.

52331640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436111 (or 436107 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 52331640 is about 7234.0611001014. The cubic root of 52331640 is about 374.0429283371.

Adding to 52331640 its reverse (4613325), we get a palindrome (56944965).

The spelling of 52331640 in words is "fifty-two million, three hundred thirty-one thousand, six hundred forty".