72750331 has 2 divisors, whose sum is σ = 72750332. Its totient is φ = 72750330.

The previous prime is 72750329. The next prime is 72750343. The reversal of 72750331 is 13305727.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 72750331 - 2¹ = 72750329 is a prime.

It is a super-2 number, since 2×72750331² = 10585221321219122, which contains 22 as substring.

Together with 72750329, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 72750331.

It is not a weakly prime, because it can be changed into another prime (72750371) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36375165 + 36375166.

It is an arithmetic number, because the mean of its divisors is an integer number (36375166).

Almost surely, 2^72750331 is an apocalyptic number.

72750331 is a deficient number, since it is larger than the sum of its proper divisors (1).

72750331 is an equidigital number, since it uses as much as digits as its factorization.

72750331 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4410, while the sum is 28.

The square root of 72750331 is about 8529.3804581576. The cubic root of 72750331 is about 417.4569135738.

The spelling of 72750331 in words is "seventy-two million, seven hundred fifty thousand, three hundred thirty-one".