79720287 has 4 divisors (see below), whose sum is σ = 106293720. Its totient is φ = 53146856.

The previous prime is 79720283. The next prime is 79720309. The reversal of 79720287 is 78202797.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78202797 = 3 ⋅26067599.

It is a cyclic number.

It is not a de Polignac number, because 79720287 - 2² = 79720283 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (79720283) 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, 13286712 + ... + 13286717.

It is an arithmetic number, because the mean of its divisors is an integer number (26573430).

Almost surely, 2^79720287 is an apocalyptic number.

79720287 is a deficient number, since it is larger than the sum of its proper divisors (26573433).

79720287 is a wasteful number, since it uses less digits than its factorization.

79720287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26573432.

The product of its (nonzero) digits is 98784, while the sum is 42.

The square root of 79720287 is about 8928.6217861437. The cubic root of 79720287 is about 430.3841654248.

The spelling of 79720287 in words is "seventy-nine million, seven hundred twenty thousand, two hundred eighty-seven".