79736421 has 4 divisors (see below), whose sum is σ = 106315232. Its totient is φ = 53157612.

The previous prime is 79736417. The next prime is 79736441. The reversal of 79736421 is 12463797.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 79736421 - 2² = 79736417 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 79736421.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79736401) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13289401 + ... + 13289406.

It is an arithmetic number, because the mean of its divisors is an integer number (26578808).

Almost surely, 2^79736421 is an apocalyptic number.

It is an amenable number.

79736421 is a deficient number, since it is larger than the sum of its proper divisors (26578811).

79736421 is a wasteful number, since it uses less digits than its factorization.

79736421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26578810.

The product of its digits is 63504, while the sum is 39.

The square root of 79736421 is about 8929.5252393394. The cubic root of 79736421 is about 430.4131975570.

The spelling of 79736421 in words is "seventy-nine million, seven hundred thirty-six thousand, four hundred twenty-one".