53686404 has 36 divisors (see below), whose sum is σ = 135983484. Its totient is φ = 17859072.

The previous prime is 53686397. The next prime is 53686417. The reversal of 53686404 is 40468635.

53686404 is a `hidden beast` number, since 5 + 3 + 6 + 8 + 640 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 27060804 + 26625600 = 5202^2 + 5160^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21004 + ... + 23420.

It is an arithmetic number, because the mean of its divisors is an integer number (3777319).

Almost surely, 2^53686404 is an apocalyptic number.

It is an amenable number.

53686404 is an abundant number, since it is smaller than the sum of its proper divisors (82297080).

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

53686404 is a wasteful number, since it uses less digits than its factorization.

53686404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3044 (or 3039 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 36.

The square root of 53686404 is about 7327.1006544199. The cubic root of 53686404 is about 377.2432158637.

The spelling of 53686404 in words is "fifty-three million, six hundred eighty-six thousand, four hundred four".