84180728 has 16 divisors (see below), whose sum is σ = 160515000. Its totient is φ = 41376736.

The previous prime is 84180721. The next prime is 84180737. The reversal of 84180728 is 82708148.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 84180691 and 84180700.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (84180721) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 88703 + ... + 89646.

Almost surely, 2^84180728 is an apocalyptic number.

It is an amenable number.

84180728 is a deficient number, since it is larger than the sum of its proper divisors (76334272).

84180728 is a wasteful number, since it uses less digits than its factorization.

84180728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178414 (or 178410 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 84180728 is about 9175.0056130773. The cubic root of 84180728 is about 438.2657769918.

The spelling of 84180728 in words is "eighty-four million, one hundred eighty thousand, seven hundred twenty-eight".