78369720 has 128 divisors (see below), whose sum is σ = 276272640. Its totient is φ = 17533440.

The previous prime is 78369701. The next prime is 78369749. The reversal of 78369720 is 2796387.

It is a super-2 number, since 2×78369720² = 12283626025756800, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 14877 + ... + 19443.

It is an arithmetic number, because the mean of its divisors is an integer number (2158380).

Almost surely, 2^78369720 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 78369720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (138136320).

78369720 is an abundant number, since it is smaller than the sum of its proper divisors (197902920).

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

78369720 is a wasteful number, since it uses less digits than its factorization.

78369720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4605 (or 4601 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 42.

The square root of 78369720 is about 8852.6673946331. The cubic root of 78369720 is about 427.9398844149.

The spelling of 78369720 in words is "seventy-eight million, three hundred sixty-nine thousand, seven hundred twenty".