79388640 has 384 divisors, whose sum is σ = 313528320. Its totient is φ = 18653184.

The previous prime is 79388629. The next prime is 79388651. The reversal of 79388640 is 4688397.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (79388629) and next prime (79388651).

It is a super-2 number, since 2×79388640² = 12605112322099200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 1689097 + ... + 1689143.

It is an arithmetic number, because the mean of its divisors is an integer number (816480).

Almost surely, 2^79388640 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 79388640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (156764160).

79388640 is an abundant number, since it is smaller than the sum of its proper divisors (234139680).

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

79388640 is a wasteful number, since it uses less digits than its factorization.

79388640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 111 (or 97 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 79388640 is about 8910.0303029788. The cubic root of 79388640 is about 429.7865174297.

The spelling of 79388640 in words is "seventy-nine million, three hundred eighty-eight thousand, six hundred forty".