72078831 has 12 divisors (see below), whose sum is σ = 113578920. Its totient is φ = 43684080.

The previous prime is 72078829. The next prime is 72078859. The reversal of 72078831 is 13887027.

It is not a de Polignac number, because 72078831 - 2¹ = 72078829 is a prime.

It is a super-2 number, since 2×72078831² = 10390715756653122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (72078821) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 363936 + ... + 364133.

It is an arithmetic number, because the mean of its divisors is an integer number (9464910).

Almost surely, 2^72078831 is an apocalyptic number.

72078831 is a deficient number, since it is larger than the sum of its proper divisors (41500089).

72078831 is a wasteful number, since it uses less digits than its factorization.

72078831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 728086 (or 728083 counting only the distinct ones).

The product of its (nonzero) digits is 18816, while the sum is 36.

The square root of 72078831 is about 8489.9252646887. The cubic root of 72078831 is about 416.1685380179.

The spelling of 72078831 in words is "seventy-two million, seventy-eight thousand, eight hundred thirty-one".