84821904 has 50 divisors (see below), whose sum is σ = 245502950. Its totient is φ = 28273536.

The previous prime is 84821899. The next prime is 84821911. The reversal of 84821904 is 40912848.

It can be written as a sum of positive squares in only one way, i.e., 76527504 + 8294400 = 8748^2 + 2880^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 31429 + ... + 34020.

It is an arithmetic number, because the mean of its divisors is an integer number (4910059).

Almost surely, 2^84821904 is an apocalyptic number.

It is an amenable number.

84821904 is an abundant number, since it is smaller than the sum of its proper divisors (160681046).

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

84821904 is a wasteful number, since it uses less digits than its factorization.

84821904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65469 (or 65454 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 84821904 is about 9209.8807809873. The cubic root of 84821904 is about 439.3756710140.

The spelling of 84821904 in words is "eighty-four million, eight hundred twenty-one thousand, nine hundred four".