52186640 has 80 divisors (see below), whose sum is σ = 136705536. Its totient is φ = 18355200.

The previous prime is 52186637. The next prime is 52186669. The reversal of 52186640 is 4668125.

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 52186597 and 52186606.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26324 + ... + 28236.

Almost surely, 2^52186640 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 52186640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68352768).

52186640 is an abundant number, since it is smaller than the sum of its proper divisors (84518896).

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

52186640 is a wasteful number, since it uses less digits than its factorization.

52186640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1968 (or 1962 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 32.

The square root of 52186640 is about 7224.0321151003. The cubic root of 52186640 is about 373.6971439368.

The spelling of 52186640 in words is "fifty-two million, one hundred eighty-six thousand, six hundred forty".