84999980 has 24 divisors (see below), whose sum is σ = 192231312. Its totient is φ = 31384512.

The previous prime is 84999979. The next prime is 85000007. The reversal of 84999980 is 8999948.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 163202 + ... + 163721.

It is an arithmetic number, because the mean of its divisors is an integer number (8009638).

Almost surely, 2^84999980 is an apocalyptic number.

It is an amenable number.

84999980 is an abundant number, since it is smaller than the sum of its proper divisors (107231332).

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

84999980 is a wasteful number, since it uses less digits than its factorization.

84999980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 326945 (or 326943 counting only the distinct ones).

The product of its (nonzero) digits is 1679616, while the sum is 56.

The square root of 84999980 is about 9219.5433726405. The cubic root of 84999980 is about 439.6829327309.

The spelling of 84999980 in words is "eighty-four million, nine hundred ninety-nine thousand, nine hundred eighty".