80857567 has 4 divisors (see below), whose sum is σ = 92408656. Its totient is φ = 69306480.

The previous prime is 80857549. The next prime is 80857577. The reversal of 80857567 is 76575808.

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

It is a cyclic number.

It is not a de Polignac number, because 80857567 - 2²³ = 72468959 is a prime.

It is a super-2 number, since 2×80857567² = 13075892282318978, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80857577) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5775534 + ... + 5775547.

It is an arithmetic number, because the mean of its divisors is an integer number (23102164).

Almost surely, 2^80857567 is an apocalyptic number.

80857567 is a deficient number, since it is larger than the sum of its proper divisors (11551089).

80857567 is a wasteful number, since it uses less digits than its factorization.

80857567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11551088.

The product of its (nonzero) digits is 470400, while the sum is 46.

The square root of 80857567 is about 8992.0835738999. The cubic root of 80857567 is about 432.4211125011.

The spelling of 80857567 in words is "eighty million, eight hundred fifty-seven thousand, five hundred sixty-seven".