84579520 has 56 divisors (see below), whose sum is σ = 205246224. Its totient is φ = 33186816.

The previous prime is 84579499. The next prime is 84579529. The reversal of 84579520 is 2597548.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (84579529) 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, 14467 + ... + 19453.

Almost surely, 2^84579520 is an apocalyptic number.

84579520 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 84579520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102623112).

84579520 is an abundant number, since it is smaller than the sum of its proper divisors (120666704).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

84579520 is a wasteful number, since it uses less digits than its factorization.

84579520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5057 (or 5047 counting only the distinct ones).

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 84579520 is about 9196.7124560899. The cubic root of 84579520 is about 438.9567570691.

The spelling of 84579520 in words is "eighty-four million, five hundred seventy-nine thousand, five hundred twenty".