79972751 has 4 divisors (see below), whose sum is σ = 80020632. Its totient is φ = 79924872.

The previous prime is 79972747. The next prime is 79972759. The reversal of 79972751 is 15727997.

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 79972751 - 2² = 79972747 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 79972696 and 79972705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79972759) 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, 21341 + ... + 24806.

It is an arithmetic number, because the mean of its divisors is an integer number (20005158).

Almost surely, 2^79972751 is an apocalyptic number.

79972751 is a deficient number, since it is larger than the sum of its proper divisors (47881).

79972751 is a wasteful number, since it uses less digits than its factorization.

79972751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47880.

The product of its digits is 277830, while the sum is 47.

The square root of 79972751 is about 8942.7485148583. The cubic root of 79972751 is about 430.8380106251.

The spelling of 79972751 in words is "seventy-nine million, nine hundred seventy-two thousand, seven hundred fifty-one".