79640736 has 96 divisors (see below), whose sum is σ = 246693888. Its totient is φ = 22014720.

The previous prime is 79640731. The next prime is 79640747. The reversal of 79640736 is 63704697.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79640731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18921 + ... + 22743.

It is an arithmetic number, because the mean of its divisors is an integer number (2569728).

Almost surely, 2^79640736 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 79640736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (123346944).

79640736 is an abundant number, since it is smaller than the sum of its proper divisors (167053152).

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

79640736 is a wasteful number, since it uses less digits than its factorization.

79640736 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3874 (or 3866 counting only the distinct ones).

The product of its (nonzero) digits is 190512, while the sum is 42.

The square root of 79640736 is about 8924.1658433716. The cubic root of 79640736 is about 430.2409610343.

The spelling of 79640736 in words is "seventy-nine million, six hundred forty thousand, seven hundred thirty-six".