78931284 has 12 divisors (see below), whose sum is σ = 184173024. Its totient is φ = 26310424.

The previous prime is 78931277. The next prime is 78931309. The reversal of 78931284 is 48213987.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3288792 + ... + 3288815.

It is an arithmetic number, because the mean of its divisors is an integer number (15347752).

Almost surely, 2^78931284 is an apocalyptic number.

It is an amenable number.

78931284 is an abundant number, since it is smaller than the sum of its proper divisors (105241740).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78931284 is a wasteful number, since it uses less digits than its factorization.

78931284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6577614 (or 6577612 counting only the distinct ones).

The product of its digits is 96768, while the sum is 42.

The square root of 78931284 is about 8884.3279993481. The cubic root of 78931284 is about 428.9595975883.

It can be divided in two parts, 789312 and 84, that added together give a triangular number (789396 = T₁₂₅₆).

The spelling of 78931284 in words is "seventy-eight million, nine hundred thirty-one thousand, two hundred eighty-four".