72388685 has 4 divisors (see below), whose sum is σ = 86866428. Its totient is φ = 57910944.

The previous prime is 72388649. The next prime is 72388697. The reversal of 72388685 is 58688327.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 53743561 + 18645124 = 7331^2 + 4318^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-72388685 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7238864 + ... + 7238873.

It is an arithmetic number, because the mean of its divisors is an integer number (21716607).

Almost surely, 2^72388685 is an apocalyptic number.

It is an amenable number.

72388685 is a deficient number, since it is larger than the sum of its proper divisors (14477743).

72388685 is a wasteful number, since it uses less digits than its factorization.

72388685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14477742.

The product of its digits is 645120, while the sum is 47.

The square root of 72388685 is about 8508.1540301055. The cubic root of 72388685 is about 416.7640302248.

The spelling of 72388685 in words is "seventy-two million, three hundred eighty-eight thousand, six hundred eighty-five".