72320436 has 18 divisors (see below), whose sum is σ = 182810082. Its totient is φ = 24106800.

The previous prime is 72320429. The next prime is 72320447. The reversal of 72320436 is 63402327.

It can be written as a sum of positive squares in only one way, i.e., 56160036 + 16160400 = 7494^2 + 4020^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

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 5 ways as a sum of consecutive naturals, for example, 1004415 + ... + 1004486.

Almost surely, 2^72320436 is an apocalyptic number.

It is an amenable number.

72320436 is an abundant number, since it is smaller than the sum of its proper divisors (110489646).

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

72320436 is a wasteful number, since it uses less digits than its factorization.

72320436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2008911 (or 2008906 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 27.

The square root of 72320436 is about 8504.1422847927. The cubic root of 72320436 is about 416.6330121796.

The spelling of 72320436 in words is "seventy-two million, three hundred twenty thousand, four hundred thirty-six".