72064521 has 12 divisors (see below), whose sum is σ = 104169780. Its totient is φ = 48007680.

The previous prime is 72064477. The next prime is 72064571. The reversal of 72064521 is 12546027.

72064521 is a `hidden beast` number, since 7 + 206 + 452 + 1 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 24950025 + 47114496 = 4995^2 + 6864^2 .

It is not a de Polignac number, because 72064521 - 2⁹ = 72064009 is a prime.

It is not an unprimeable number, because it can be changed into a prime (72064571) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 17281 + ... + 21041.

It is an arithmetic number, because the mean of its divisors is an integer number (8680815).

Almost surely, 2^72064521 is an apocalyptic number.

It is an amenable number.

72064521 is a deficient number, since it is larger than the sum of its proper divisors (32105259).

72064521 is a wasteful number, since it uses less digits than its factorization.

72064521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5896 (or 5893 counting only the distinct ones).

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

The square root of 72064521 is about 8489.0824592532. The cubic root of 72064521 is about 416.1409951835.

The spelling of 72064521 in words is "seventy-two million, sixty-four thousand, five hundred twenty-one".