72691620 has 48 divisors (see below), whose sum is σ = 207385920. Its totient is φ = 19017856.

The previous prime is 72691589. The next prime is 72691631. The reversal of 72691620 is 2619627.

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 15 ways as a sum of consecutive naturals, for example, 8250 + ... + 14609.

It is an arithmetic number, because the mean of its divisors is an integer number (4320540).

Almost surely, 2^72691620 is an apocalyptic number.

It is an amenable number.

72691620 is an abundant number, since it is smaller than the sum of its proper divisors (134694300).

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

72691620 is a wasteful number, since it uses less digits than its factorization.

72691620 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22924 (or 22922 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 33.

The square root of 72691620 is about 8525.9380715555. The cubic root of 72691620 is about 417.3445846050.

Adding to 72691620 its sum of digits (33), we get a triangular number (72691653 = T₁₂₀₅₇).

The spelling of 72691620 in words is "seventy-two million, six hundred ninety-one thousand, six hundred twenty".