79578521 has 8 divisors (see below), whose sum is σ = 87657024. Its totient is φ = 71640720.

The previous prime is 79578503. The next prime is 79578529. The reversal of 79578521 is 12587597.

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 79578521 - 2¹⁰ = 79577497 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (79578529) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33986 + ... + 36251.

It is an arithmetic number, because the mean of its divisors is an integer number (10957128).

Almost surely, 2^79578521 is an apocalyptic number.

It is an amenable number.

79578521 is a deficient number, since it is larger than the sum of its proper divisors (8078503).

79578521 is a wasteful number, since it uses less digits than its factorization.

79578521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70351.

The product of its digits is 176400, while the sum is 44.

The square root of 79578521 is about 8920.6794023774. The cubic root of 79578521 is about 430.1288977195.

The spelling of 79578521 in words is "seventy-nine million, five hundred seventy-eight thousand, five hundred twenty-one".