78920712 has 48 divisors (see below), whose sum is σ = 230188140. Its totient is φ = 24283008.

The previous prime is 78920599. The next prime is 78920713. The reversal of 78920712 is 21702987.

It can be written as a sum of positive squares in 2 ways, for example, as 70660836 + 8259876 = 8406^2 + 2874^2 .

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

It is not an unprimeable number, because it can be changed into a prime (78920713) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 41223 + ... + 43094.

Almost surely, 2^78920712 is an apocalyptic number.

78920712 is a gapful number since it is divisible by the number (72) formed by its first and last digit.

It is an amenable number.

78920712 is an abundant number, since it is smaller than the sum of its proper divisors (151267428).

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

78920712 is a wasteful number, since it uses less digits than its factorization.

78920712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 84342 (or 84335 counting only the distinct ones).

The product of its (nonzero) digits is 14112, while the sum is 36.

The square root of 78920712 is about 8883.7329991395. The cubic root of 78920712 is about 428.9404452188.

The spelling of 78920712 in words is "seventy-eight million, nine hundred twenty thousand, seven hundred twelve".