78385716 has 36 divisors (see below), whose sum is σ = 208572000. Its totient is φ = 24753168.

The previous prime is 78385693. The next prime is 78385729. The reversal of 78385716 is 61758387.

78385716 is a `hidden beast` number, since 78 + 3 + 8 + 571 + 6 = 666.

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

It is a super-2 number, since 2×78385716² = 12288640945665312, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 56616 + ... + 57983.

Almost surely, 2^78385716 is an apocalyptic number.

78385716 is a gapful number since it is divisible by the number (76) formed by its first and last digit.

It is an amenable number.

78385716 is an abundant number, since it is smaller than the sum of its proper divisors (130186284).

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

78385716 is a wasteful number, since it uses less digits than its factorization.

78385716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114628 (or 114623 counting only the distinct ones).

The product of its digits is 282240, while the sum is 45.

The square root of 78385716 is about 8853.5708050481. The cubic root of 78385716 is about 427.9689979582.

The spelling of 78385716 in words is "seventy-eight million, three hundred eighty-five thousand, seven hundred sixteen".