79980731 has 4 divisors (see below), whose sum is σ = 81840792. Its totient is φ = 78120672.

The previous prime is 79980721. The next prime is 79980743. The reversal of 79980731 is 13708997.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 79980731 - 2¹⁴ = 79964347 is a prime.

It is a super-2 number, since 2×79980731² = 12793834662588722, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79980701) 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 3 ways as a sum of consecutive naturals, for example, 929966 + ... + 930051.

It is an arithmetic number, because the mean of its divisors is an integer number (20460198).

Almost surely, 2^79980731 is an apocalyptic number.

79980731 is a deficient number, since it is larger than the sum of its proper divisors (1860061).

79980731 is a wasteful number, since it uses less digits than its factorization.

79980731 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1860060.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 79980731 is about 8943.1946752824. The cubic root of 79980731 is about 430.8523403934.

The spelling of 79980731 in words is "seventy-nine million, nine hundred eighty thousand, seven hundred thirty-one".