72878931 has 12 divisors (see below), whose sum is σ = 106039752. Its totient is φ = 48230496.

The previous prime is 72878921. The next prime is 72878941. The reversal of 72878931 is 13987827.

It is an interprime number because it is at equal distance from previous prime (72878921) and next prime (72878941).

It is not a de Polignac number, because 72878931 - 2⁶ = 72878867 is a prime.

It is a super-2 number, since 2×72878931² = 10622677167405522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (72878921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28321 + ... + 30786.

It is an arithmetic number, because the mean of its divisors is an integer number (8836646).

Almost surely, 2^72878931 is an apocalyptic number.

72878931 is a deficient number, since it is larger than the sum of its proper divisors (33160821).

72878931 is a wasteful number, since it uses less digits than its factorization.

72878931 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59250 (or 59247 counting only the distinct ones).

The product of its digits is 169344, while the sum is 45.

The square root of 72878931 is about 8536.9157779610. The cubic root of 72878931 is about 417.7027468532.

The spelling of 72878931 in words is "seventy-two million, eight hundred seventy-eight thousand, nine hundred thirty-one".