78989736 has 128 divisors (see below), whose sum is σ = 241459200. Its totient is φ = 21047040.

The previous prime is 78989653. The next prime is 78989737. The reversal of 78989736 is 63798987.

It is not an unprimeable number, because it can be changed into a prime (78989737) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 150771 + ... + 151293.

It is an arithmetic number, because the mean of its divisors is an integer number (1886400).

Almost surely, 2^78989736 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 78989736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (120729600).

78989736 is an abundant number, since it is smaller than the sum of its proper divisors (162469464).

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

78989736 is a wasteful number, since it uses less digits than its factorization.

78989736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 599 (or 595 counting only the distinct ones).

The product of its digits is 4572288, while the sum is 57.

The square root of 78989736 is about 8887.6170034492. The cubic root of 78989736 is about 429.0654591188.

It can be divided in two parts, 789 and 89736, that added together give a triangular number (90525 = T₄₂₅).

The spelling of 78989736 in words is "seventy-eight million, nine hundred eighty-nine thousand, seven hundred thirty-six".