83128820 has 12 divisors (see below), whose sum is σ = 174570564. Its totient is φ = 33251520.

The previous prime is 83128813. The next prime is 83128849. The reversal of 83128820 is 2882138.

It can be written as a sum of positive squares in 2 ways, for example, as 24820324 + 58308496 = 4982^2 + 7636^2 .

It is a hoax number, since the sum of its digits (32) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2078201 + ... + 2078240.

It is an arithmetic number, because the mean of its divisors is an integer number (14547547).

Almost surely, 2^83128820 is an apocalyptic number.

It is an amenable number.

83128820 is an abundant number, since it is smaller than the sum of its proper divisors (91441744).

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

83128820 is a wasteful number, since it uses less digits than its factorization.

83128820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4156450 (or 4156448 counting only the distinct ones).

The product of its (nonzero) digits is 6144, while the sum is 32.

The square root of 83128820 is about 9117.5007540444. The cubic root of 83128820 is about 436.4326219585.

The spelling of 83128820 in words is "eighty-three million, one hundred twenty-eight thousand, eight hundred twenty".