52721604 has 60 divisors (see below), whose sum is σ = 148438444. Its totient is φ = 16220736.

The previous prime is 52721597. The next prime is 52721621. The reversal of 52721604 is 40612725.

52721604 is a `hidden beast` number, since 52 + 7 + 2 + 1 + 604 = 666.

52721604 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 30140100 + 22581504 = 5490^2 + 4752^2 .

It is a Harshad number since it is a multiple of its sum of digits (27).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2047 + ... + 10470.

Almost surely, 2^52721604 is an apocalyptic number.

52721604 is a gapful number since it is divisible by the number (54) formed by its first and last digit.

It is an amenable number.

52721604 is an abundant number, since it is smaller than the sum of its proper divisors (95716840).

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

52721604 is a wasteful number, since it uses less digits than its factorization.

52721604 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12546 (or 12535 counting only the distinct ones).

The product of its (nonzero) digits is 3360, while the sum is 27.

The square root of 52721604 is about 7260.9643987559. The cubic root of 52721604 is about 374.9697255560.

The spelling of 52721604 in words is "fifty-two million, seven hundred twenty-one thousand, six hundred four".