83899980 has 72 divisors (see below), whose sum is σ = 255370752. Its totient is φ = 22296576.

The previous prime is 83899973. The next prime is 83900039. The reversal of 83899980 is 8999838.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 68332 + ... + 69548.

It is an arithmetic number, because the mean of its divisors is an integer number (3546816).

Almost surely, 2^83899980 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 83899980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (127685376).

83899980 is an abundant number, since it is smaller than the sum of its proper divisors (171470772).

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

83899980 is a wasteful number, since it uses less digits than its factorization.

83899980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1615 (or 1610 counting only the distinct ones).

The product of its (nonzero) digits is 1119744, while the sum is 54.

The square root of 83899980 is about 9159.6932263040. The cubic root of 83899980 is about 437.7780197509.

The spelling of 83899980 in words is "eighty-three million, eight hundred ninety-nine thousand, nine hundred eighty".