84321728 has 28 divisors (see below), whose sum is σ = 170489880. Its totient is φ = 41363712.

The previous prime is 84321701. The next prime is 84321737. The reversal of 84321728 is 82712348.

It is a super-2 number, since 2×84321728² = 14220307625811968, which contains 22 as substring.

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, 9038 + ... + 15821.

Almost surely, 2^84321728 is an apocalyptic number.

It is an amenable number.

84321728 is an abundant number, since it is smaller than the sum of its proper divisors (86168152).

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

84321728 is a wasteful number, since it uses less digits than its factorization.

84321728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24924 (or 24914 counting only the distinct ones).

The product of its digits is 21504, while the sum is 35.

The square root of 84321728 is about 9182.6863171950. The cubic root of 84321728 is about 438.5103341737.

The spelling of 84321728 in words is "eighty-four million, three hundred twenty-one thousand, seven hundred twenty-eight".