72721875 has 24 divisors (see below), whose sum is σ = 121210992. Its totient is φ = 38780000.

The previous prime is 72721841. The next prime is 72721897. The reversal of 72721875 is 57812727.

It is not a de Polignac number, because 72721875 - 2¹⁵ = 72689107 is a prime.

It is a super-2 number, since 2×72721875² = 10576942207031250, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5497 + ... + 13253.

It is an arithmetic number, because the mean of its divisors is an integer number (5050458).

Almost surely, 2^72721875 is an apocalyptic number.

72721875 is a gapful number since it is divisible by the number (75) formed by its first and last digit.

72721875 is a deficient number, since it is larger than the sum of its proper divisors (48489117).

72721875 is an frugal number, since it uses more digits than its factorization.

72721875 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7785 (or 7765 counting only the distinct ones).

The product of its digits is 54880, while the sum is 39.

The square root of 72721875 is about 8527.7121785389. The cubic root of 72721875 is about 417.4024776103.

The spelling of 72721875 in words is "seventy-two million, seven hundred twenty-one thousand, eight hundred seventy-five".