79401569 has 8 divisors (see below), whose sum is σ = 85641192. Its totient is φ = 73180800.

The previous prime is 79401533. The next prime is 79401587. The reversal of 79401569 is 96510497.

It can be written as a sum of positive squares in 4 ways, for example, as 33500944 + 45900625 = 5788^2 + 6775^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 79401569 - 2²⁰ = 78352993 is a prime.

It is a super-2 number, since 2×79401569² = 12609218319323522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (79401529) 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 7 ways as a sum of consecutive naturals, for example, 4757 + ... + 13469.

It is an arithmetic number, because the mean of its divisors is an integer number (10705149).

Almost surely, 2^79401569 is an apocalyptic number.

It is an amenable number.

79401569 is a deficient number, since it is larger than the sum of its proper divisors (6239623).

79401569 is a wasteful number, since it uses less digits than its factorization.

79401569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9427.

The product of its (nonzero) digits is 68040, while the sum is 41.

The square root of 79401569 is about 8910.7558040831. The cubic root of 79401569 is about 429.8098474185.

The spelling of 79401569 in words is "seventy-nine million, four hundred one thousand, five hundred sixty-nine".