80728957 has 2 divisors, whose sum is σ = 80728958. Its totient is φ = 80728956.

The previous prime is 80728951. The next prime is 80728987. The reversal of 80728957 is 75982708.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 66243321 + 14485636 = 8139^2 + 3806^2 .

It is a cyclic number.

It is not a de Polignac number, because 80728957 - 2¹⁹ = 80204669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (80728951) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40364478 + 40364479.

It is an arithmetic number, because the mean of its divisors is an integer number (40364479).

Almost surely, 2^80728957 is an apocalyptic number.

It is an amenable number.

80728957 is a deficient number, since it is larger than the sum of its proper divisors (1).

80728957 is an equidigital number, since it uses as much as digits as its factorization.

80728957 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 282240, while the sum is 46.

The square root of 80728957 is about 8984.9294376751. The cubic root of 80728957 is about 432.1917248122.

The spelling of 80728957 in words is "eighty million, seven hundred twenty-eight thousand, nine hundred fifty-seven".