72546021 has 24 divisors (see below), whose sum is σ = 111794904. Its totient is φ = 45173760.

The previous prime is 72546007. The next prime is 72546041. The reversal of 72546021 is 12064527.

72546021 is a `hidden beast` number, since 7 + 2 + 54 + 602 + 1 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 12173121 + 60372900 = 3489^2 + 7770^2 .

It is not a de Polignac number, because 72546021 - 2⁵ = 72545989 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72546041) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19231 + ... + 22691.

It is an arithmetic number, because the mean of its divisors is an integer number (4658121).

Almost surely, 2^72546021 is an apocalyptic number.

It is an amenable number.

72546021 is a deficient number, since it is larger than the sum of its proper divisors (39248883).

72546021 is a wasteful number, since it uses less digits than its factorization.

72546021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3621 (or 3618 counting only the distinct ones).

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

The square root of 72546021 is about 8517.3952004119. The cubic root of 72546021 is about 417.0657557228.

The spelling of 72546021 in words is "seventy-two million, five hundred forty-six thousand, twenty-one".