78969312 has 36 divisors (see below), whose sum is σ = 224569800. Its totient is φ = 26323008.

The previous prime is 78969287. The next prime is 78969337. The reversal of 78969312 is 21396987.

It is an interprime number because it is at equal distance from previous prime (78969287) and next prime (78969337).

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 136812 + ... + 137387.

It is an arithmetic number, because the mean of its divisors is an integer number (6238050).

Almost surely, 2^78969312 is an apocalyptic number.

78969312 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

78969312 is an abundant number, since it is smaller than the sum of its proper divisors (145600488).

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

78969312 is a wasteful number, since it uses less digits than its factorization.

78969312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274215 (or 274204 counting only the distinct ones).

The product of its digits is 163296, while the sum is 45.

The square root of 78969312 is about 8886.4679147567. The cubic root of 78969312 is about 429.0284754600.

The spelling of 78969312 in words is "seventy-eight million, nine hundred sixty-nine thousand, three hundred twelve".