52756440 has 128 divisors (see below), whose sum is σ = 182891520. Its totient is φ = 12032000.

The previous prime is 52756439. The next prime is 52756453. The reversal of 52756440 is 4465725.

It is a super-2 number, since 2×52756440² = 5566483922947200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

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, 21265 + ... + 23615.

It is an arithmetic number, because the mean of its divisors is an integer number (1428840).

Almost surely, 2^52756440 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 52756440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91445760).

52756440 is an abundant number, since it is smaller than the sum of its proper divisors (130135080).

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

52756440 is a wasteful number, since it uses less digits than its factorization.

52756440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2393 (or 2389 counting only the distinct ones).

The product of its (nonzero) digits is 33600, while the sum is 33.

The square root of 52756440 is about 7263.3628575199. The cubic root of 52756440 is about 375.0522949292.

The spelling of 52756440 in words is "fifty-two million, seven hundred fifty-six thousand, four hundred forty".