84166820 has 12 divisors (see below), whose sum is σ = 176750364. Its totient is φ = 33666720.

The previous prime is 84166799. The next prime is 84166853. The reversal of 84166820 is 2866148.

It can be written as a sum of positive squares in 2 ways, for example, as 18524416 + 65642404 = 4304^2 + 8102^2 .

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, 2104151 + ... + 2104190.

It is an arithmetic number, because the mean of its divisors is an integer number (14729197).

Almost surely, 2^84166820 is an apocalyptic number.

It is an amenable number.

84166820 is an abundant number, since it is smaller than the sum of its proper divisors (92583544).

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

84166820 is a wasteful number, since it uses less digits than its factorization.

84166820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4208350 (or 4208348 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 35.

The square root of 84166820 is about 9174.2476530776. The cubic root of 84166820 is about 438.2416394951.

The spelling of 84166820 in words is "eighty-four million, one hundred sixty-six thousand, eight hundred twenty".