80685257 has 4 divisors (see below), whose sum is σ = 80724756. Its totient is φ = 80645760.

The previous prime is 80685251. The next prime is 80685263. The reversal of 80685257 is 75258608.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (80685251) and next prime (80685263).

It can be written as a sum of positive squares in 2 ways, for example, as 51998521 + 28686736 = 7211^2 + 5356^2 .

It is a cyclic number.

It is not a de Polignac number, because 80685257 - 2²⁴ = 63908041 is a prime.

It is a super-2 number, since 2×80685257² = 13020221394312098, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80685251) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 16508 + ... + 20829.

It is an arithmetic number, because the mean of its divisors is an integer number (20181189).

Almost surely, 2^80685257 is an apocalyptic number.

It is an amenable number.

80685257 is a deficient number, since it is larger than the sum of its proper divisors (39499).

80685257 is a wasteful number, since it uses less digits than its factorization.

80685257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39498.

The product of its (nonzero) digits is 134400, while the sum is 41.

The square root of 80685257 is about 8982.4972585579. The cubic root of 80685257 is about 432.1137264169.

The spelling of 80685257 in words is "eighty million, six hundred eighty-five thousand, two hundred fifty-seven".