52187440 has 20 divisors (see below), whose sum is σ = 121335984. Its totient is φ = 20874944.

The previous prime is 52187419. The next prime is 52187449. The reversal of 52187440 is 4478125.

It is a tau number, because it is divible by the number of its divisors (20).

It is not an unprimeable number, because it can be changed into a prime (52187449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 326092 + ... + 326251.

Almost surely, 2^52187440 is an apocalyptic number.

It is an amenable number.

52187440 is an abundant number, since it is smaller than the sum of its proper divisors (69148544).

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

52187440 is a wasteful number, since it uses less digits than its factorization.

52187440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 652356 (or 652350 counting only the distinct ones).

The product of its (nonzero) digits is 8960, while the sum is 31.

The square root of 52187440 is about 7224.0874856275. The cubic root of 52187440 is about 373.6990534689.

The spelling of 52187440 in words is "fifty-two million, one hundred eighty-seven thousand, four hundred forty".