78070392 has 160 divisors (see below), whose sum is σ = 244371600. Its totient is φ = 23141376.

The previous prime is 78070357. The next prime is 78070417. The reversal of 78070392 is 29307087.

It is a super-2 number, since 2×78070392² = 12189972214067328, which contains 22 as substring.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 209118 + ... + 209490.

Almost surely, 2^78070392 is an apocalyptic number.

78070392 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78070392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (122185800).

78070392 is an abundant number, since it is smaller than the sum of its proper divisors (166301208).

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

78070392 is a wasteful number, since it uses less digits than its factorization.

78070392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 427 (or 414 counting only the distinct ones).

The product of its (nonzero) digits is 21168, while the sum is 36.

The square root of 78070392 is about 8835.7451298688. The cubic root of 78070392 is about 427.3943598622.

The spelling of 78070392 in words is "seventy-eight million, seventy thousand, three hundred ninety-two".