84809920 has 224 divisors, whose sum is σ = 243230400. Its totient is φ = 27869184.

The previous prime is 84809917. The next prime is 84809951. The reversal of 84809920 is 2990848.

It is a happy number.

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

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2292142 + ... + 2292178.

It is an arithmetic number, because the mean of its divisors is an integer number (1085850).

Almost surely, 2^84809920 is an apocalyptic number.

84809920 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 84809920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (121615200).

84809920 is an abundant number, since it is smaller than the sum of its proper divisors (158420480).

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

84809920 is a wasteful number, since it uses less digits than its factorization.

84809920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 115 (or 105 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 40.

The square root of 84809920 is about 9209.2301524069. The cubic root of 84809920 is about 439.3549777505.

The spelling of 84809920 in words is "eighty-four million, eight hundred nine thousand, nine hundred twenty".