79644390 has 64 divisors (see below), whose sum is σ = 229962240. Its totient is φ = 17245440.

The previous prime is 79644379. The next prime is 79644391. The reversal of 79644390 is 9344697.

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 (79644391) 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, 5991 + ... + 13970.

It is an arithmetic number, because the mean of its divisors is an integer number (3593160).

Almost surely, 2^79644390 is an apocalyptic number.

79644390 is a gapful number since it is divisible by the number (70) formed by its first and last digit.

79644390 is an abundant number, since it is smaller than the sum of its proper divisors (150317850).

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

79644390 is a wasteful number, since it uses less digits than its factorization.

79644390 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19997.

The product of its (nonzero) digits is 163296, while the sum is 42.

The square root of 79644390 is about 8924.3705660399. The cubic root of 79644390 is about 430.2475409017.

The spelling of 79644390 in words is "seventy-nine million, six hundred forty-four thousand, three hundred ninety".