80728525 has 6 divisors (see below), whose sum is σ = 100103402. Its totient is φ = 64582800.

The previous prime is 80728523. The next prime is 80728537. The reversal of 80728525 is 52582708.

It can be written as a sum of positive squares in 3 ways, for example, as 12517444 + 68211081 = 3538^2 + 8259^2 .

It is not a de Polignac number, because 80728525 - 2¹ = 80728523 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80728523) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1614546 + ... + 1614595.

Almost surely, 2^80728525 is an apocalyptic number.

It is an amenable number.

80728525 is a deficient number, since it is larger than the sum of its proper divisors (19374877).

80728525 is a wasteful number, since it uses less digits than its factorization.

80728525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3229151 (or 3229146 counting only the distinct ones).

The product of its (nonzero) digits is 44800, while the sum is 37.

The square root of 80728525 is about 8984.9053973873. The cubic root of 80728525 is about 432.1909538903.

The spelling of 80728525 in words is "eighty million, seven hundred twenty-eight thousand, five hundred twenty-five".