80647728 has 120 divisors (see below), whose sum is σ = 256738032. Its totient is φ = 21676032.

The previous prime is 80647717. The next prime is 80647733. The reversal of 80647728 is 82774608.

80647728 = 1572² + 1573² + ... + 1603².

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a self number, because there is not a number n which added to its sum of digits gives 80647728.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 38976 + ... + 40992.

Almost surely, 2^80647728 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 80647728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (128369016).

80647728 is an abundant number, since it is smaller than the sum of its proper divisors (176090304).

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

80647728 is a wasteful number, since it uses less digits than its factorization.

80647728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2059 (or 2046 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 42.

The square root of 80647728 is about 8980.4080085484. The cubic root of 80647728 is about 432.0467199129.

The spelling of 80647728 in words is "eighty million, six hundred forty-seven thousand, seven hundred twenty-eight".