80749728 has 72 divisors (see below), whose sum is σ = 243154548. Its totient is φ = 25331712.

The previous prime is 80749667. The next prime is 80749733. The reversal of 80749728 is 82794708.

It can be written as a sum of positive squares in 2 ways, for example, as 78641424 + 2108304 = 8868^2 + 1452^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3351 + ... + 13142.

Almost surely, 2^80749728 is an apocalyptic number.

It is an amenable number.

80749728 is an abundant number, since it is smaller than the sum of its proper divisors (162404820).

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

80749728 is a wasteful number, since it uses less digits than its factorization.

80749728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16526 (or 16515 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 80749728 is about 8986.0852433081. The cubic root of 80749728 is about 432.2287882768.

The spelling of 80749728 in words is "eighty million, seven hundred forty-nine thousand, seven hundred twenty-eight".