80018728 has 64 divisors (see below), whose sum is σ = 169128000. Its totient is φ = 35269632.

The previous prime is 80018707. The next prime is 80018759. The reversal of 80018728 is 82781008.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 80018693 and 80018702.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 446943 + ... + 447121.

It is an arithmetic number, because the mean of its divisors is an integer number (2642625).

Almost surely, 2^80018728 is an apocalyptic number.

It is an amenable number.

80018728 is an abundant number, since it is smaller than the sum of its proper divisors (89109272).

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

80018728 is a wasteful number, since it uses less digits than its factorization.

80018728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 7168, while the sum is 34.

The square root of 80018728 is about 8945.3187757620. The cubic root of 80018728 is about 430.9205589270.

The spelling of 80018728 in words is "eighty million, eighteen thousand, seven hundred twenty-eight".