78989331 has 12 divisors (see below), whose sum is σ = 106609496. Its totient is φ = 52016640.

The previous prime is 78989297. The next prime is 78989353. The reversal of 78989331 is 13398987.

It is not a de Polignac number, because 78989331 - 2¹¹ = 78987283 is a prime.

It is a super-2 number, since 2×78989331² = 12478628823655122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78989371) 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, 151351 + ... + 151871.

Almost surely, 2^78989331 is an apocalyptic number.

78989331 is a deficient number, since it is larger than the sum of its proper divisors (27620165).

78989331 is an frugal number, since it uses more digits than its factorization.

78989331 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1142 (or 621 counting only the distinct ones).

The product of its digits is 326592, while the sum is 48.

The square root of 78989331 is about 8887.5942189099. The cubic root of 78989331 is about 429.0647258092.

The spelling of 78989331 in words is "seventy-eight million, nine hundred eighty-nine thousand, three hundred thirty-one".