78027831 has 12 divisors (see below), whose sum is σ = 128807952. Its totient is φ = 44587296.

The previous prime is 78027827. The next prime is 78027863. The reversal of 78027831 is 13872087.

It is not a de Polignac number, because 78027831 - 2² = 78027827 is a prime.

It is a super-2 number, since 2×78027831² = 12176684821129122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78028831) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 619206 + ... + 619331.

It is an arithmetic number, because the mean of its divisors is an integer number (10733996).

Almost surely, 2^78027831 is an apocalyptic number.

78027831 is a deficient number, since it is larger than the sum of its proper divisors (50780121).

78027831 is a wasteful number, since it uses less digits than its factorization.

78027831 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1238550 (or 1238547 counting only the distinct ones).

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

The square root of 78027831 is about 8833.3363459114. The cubic root of 78027831 is about 427.3166793765.

The spelling of 78027831 in words is "seventy-eight million, twenty-seven thousand, eight hundred thirty-one".