72156020 has 12 divisors (see below), whose sum is σ = 151527684. Its totient is φ = 28862400.

The previous prime is 72156017. The next prime is 72156059. The reversal of 72156020 is 2065127.

It can be written as a sum of positive squares in 2 ways, for example, as 56490256 + 15665764 = 7516^2 + 3958^2 .

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1803881 + ... + 1803920.

It is an arithmetic number, because the mean of its divisors is an integer number (12627307).

Almost surely, 2^72156020 is an apocalyptic number.

It is an amenable number.

72156020 is an abundant number, since it is smaller than the sum of its proper divisors (79371664).

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

72156020 is a wasteful number, since it uses less digits than its factorization.

72156020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3607810 (or 3607808 counting only the distinct ones).

The product of its (nonzero) digits is 840, while the sum is 23.

The square root of 72156020 is about 8494.4699658072. The cubic root of 72156020 is about 416.3170428916.

The spelling of 72156020 in words is "seventy-two million, one hundred fifty-six thousand, twenty".