79724457 has 6 divisors (see below), whose sum is σ = 115157562. Its totient is φ = 53149632.

The previous prime is 79724431. The next prime is 79724461. The reversal of 79724457 is 75442797.

It can be written as a sum of positive squares in only one way, i.e., 54110736 + 25613721 = 7356^2 + 5061^2 .

It is not a de Polignac number, because 79724457 - 2¹⁰ = 79723433 is a prime.

It is not an unprimeable number, because it can be changed into a prime (79724497) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4429128 + ... + 4429145.

It is an arithmetic number, because the mean of its divisors is an integer number (19192927).

Almost surely, 2^79724457 is an apocalyptic number.

It is an amenable number.

79724457 is a deficient number, since it is larger than the sum of its proper divisors (35433105).

79724457 is a wasteful number, since it uses less digits than its factorization.

79724457 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8858279 (or 8858276 counting only the distinct ones).

The product of its digits is 493920, while the sum is 45.

The square root of 79724457 is about 8928.8553017730. The cubic root of 79724457 is about 430.3916694565.

The spelling of 79724457 in words is "seventy-nine million, seven hundred twenty-four thousand, four hundred fifty-seven".