79643136 has 80 divisors (see below), whose sum is σ = 223423200. Its totient is φ = 25141248.

The previous prime is 79643131. The next prime is 79643141. The reversal of 79643136 is 63134697.

It is an interprime number because it is at equal distance from previous prime (79643131) and next prime (79643141).

It is a super-2 number, since 2×79643136² = 12686058223828992, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 79643094 and 79643103.

It is not an unprimeable number, because it can be changed into a prime (79643131) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27820 + ... + 30548.

It is an arithmetic number, because the mean of its divisors is an integer number (2792790).

Almost surely, 2^79643136 is an apocalyptic number.

79643136 is a gapful number since it is divisible by the number (76) 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 79643136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (111711600).

79643136 is an abundant number, since it is smaller than the sum of its proper divisors (143780064).

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

79643136 is a wasteful number, since it uses less digits than its factorization.

79643136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2769 (or 2753 counting only the distinct ones).

The product of its digits is 81648, while the sum is 39.

The square root of 79643136 is about 8924.3003087077. The cubic root of 79643136 is about 430.2452828090.

The spelling of 79643136 in words is "seventy-nine million, six hundred forty-three thousand, one hundred thirty-six".