72721850 has 24 divisors (see below), whose sum is σ = 139929660. Its totient is φ = 28085120.

The previous prime is 72721841. The next prime is 72721897. The reversal of 72721850 is 5812727.

It can be written as a sum of positive squares in 6 ways, for example, as 27952369 + 44769481 = 5287^2 + 6691^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23627 + ... + 26526.

Almost surely, 2^72721850 is an apocalyptic number.

72721850 is a deficient number, since it is larger than the sum of its proper divisors (67207810).

72721850 is a wasteful number, since it uses less digits than its factorization.

72721850 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50194 (or 50189 counting only the distinct ones).

The product of its (nonzero) digits is 7840, while the sum is 32.

The square root of 72721850 is about 8527.7107127294. The cubic root of 72721850 is about 417.4024297794.

It can be divided in two parts, 727218 and 50, that multiplied together give a square (36360900 = 6030²).

The spelling of 72721850 in words is "seventy-two million, seven hundred twenty-one thousand, eight hundred fifty".