78738816 has 64 divisors (see below), whose sum is σ = 225252720. Its totient is φ = 24225792.

The previous prime is 78738773. The next prime is 78738823. The reversal of 78738816 is 61883787.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×78738816² = 12399602290163712, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 2895 + ... + 12878.

Almost surely, 2^78738816 is an apocalyptic number.

It is an amenable number.

78738816 is an abundant number, since it is smaller than the sum of its proper divisors (146513904).

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

78738816 is a wasteful number, since it uses less digits than its factorization.

78738816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15803 (or 15791 counting only the distinct ones).

The product of its digits is 451584, while the sum is 48.

The square root of 78738816 is about 8873.4895052623. The cubic root of 78738816 is about 428.6106519022.

The spelling of 78738816 in words is "seventy-eight million, seven hundred thirty-eight thousand, eight hundred sixteen".