84579561 has 24 divisors (see below), whose sum is σ = 133941600. Its totient is φ = 51004800.

The previous prime is 84579529. The next prime is 84579569. The reversal of 84579561 is 16597548.

84579561 is a `hidden beast` number, since 84 + 5 + 7 + 9 + 561 = 666.

It is not a de Polignac number, because 84579561 - 2⁵ = 84579529 is a prime.

It is not an unprimeable number, because it can be changed into a prime (84579569) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18865 + ... + 22913.

It is an arithmetic number, because the mean of its divisors is an integer number (5580900).

Almost surely, 2^84579561 is an apocalyptic number.

It is an amenable number.

84579561 is a deficient number, since it is larger than the sum of its proper divisors (49362039).

84579561 is a wasteful number, since it uses less digits than its factorization.

84579561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4277 (or 4274 counting only the distinct ones).

The product of its digits is 302400, while the sum is 45.

The square root of 84579561 is about 9196.7146851471. The cubic root of 84579561 is about 438.9568279973.

The spelling of 84579561 in words is "eighty-four million, five hundred seventy-nine thousand, five hundred sixty-one".