72031775 has 6 divisors (see below), whose sum is σ = 89319432. Its totient is φ = 57625400.

The previous prime is 72031769. The next prime is 72031781. The reversal of 72031775 is 57713027.

It is an interprime number because it is at equal distance from previous prime (72031769) and next prime (72031781).

It is not a de Polignac number, because 72031775 - 2⁴ = 72031759 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 5 ways as a sum of consecutive naturals, for example, 1440611 + ... + 1440660.

It is an arithmetic number, because the mean of its divisors is an integer number (14886572).

Almost surely, 2^72031775 is an apocalyptic number.

72031775 is a deficient number, since it is larger than the sum of its proper divisors (17287657).

72031775 is a wasteful number, since it uses less digits than its factorization.

72031775 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2881281 (or 2881276 counting only the distinct ones).

The product of its (nonzero) digits is 10290, while the sum is 32.

The square root of 72031775 is about 8487.1535275380. The cubic root of 72031775 is about 416.0779543723.

The spelling of 72031775 in words is "seventy-two million, thirty-one thousand, seven hundred seventy-five".