84189128 has 8 divisors (see below), whose sum is σ = 157854630. Its totient is φ = 42094560.

The previous prime is 84189121. The next prime is 84189137. The reversal of 84189128 is 82198148.

It can be written as a sum of positive squares in only one way, i.e., 78889924 + 5299204 = 8882^2 + 2302^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (84189121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5261813 + ... + 5261828.

Almost surely, 2^84189128 is an apocalyptic number.

It is an amenable number.

84189128 is a deficient number, since it is larger than the sum of its proper divisors (73665502).

84189128 is a wasteful number, since it uses less digits than its factorization.

84189128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10523647 (or 10523643 counting only the distinct ones).

The product of its digits is 36864, while the sum is 41.

The square root of 84189128 is about 9175.4633670458. The cubic root of 84189128 is about 438.2803540024.

The spelling of 84189128 in words is "eighty-four million, one hundred eighty-nine thousand, one hundred twenty-eight".