80564639 has 4 divisors (see below), whose sum is σ = 83342760. Its totient is φ = 77786520.

The previous prime is 80564633. The next prime is 80564647. The reversal of 80564639 is 93646508.

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 80564639 - 2⁸ = 80564383 is a prime.

It is a super-2 number, since 2×80564639² = 12981322114400642, which contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 80564596 and 80564605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80564633) 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, 1389017 + ... + 1389074.

It is an arithmetic number, because the mean of its divisors is an integer number (20835690).

Almost surely, 2^80564639 is an apocalyptic number.

80564639 is a deficient number, since it is larger than the sum of its proper divisors (2778121).

80564639 is a wasteful number, since it uses less digits than its factorization.

80564639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2778120.

The product of its (nonzero) digits is 155520, while the sum is 41.

The square root of 80564639 is about 8975.7806902798. The cubic root of 80564639 is about 431.8982938869.

The spelling of 80564639 in words is "eighty million, five hundred sixty-four thousand, six hundred thirty-nine".