80817639 has 16 divisors (see below), whose sum is σ = 123801600. Its totient is φ = 45937440.

The previous prime is 80817623. The next prime is 80817641. The reversal of 80817639 is 93671808.

It is not a de Polignac number, because 80817639 - 2⁴ = 80817623 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 80817639.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80817689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 6064 + ... + 14085.

It is an arithmetic number, because the mean of its divisors is an integer number (7737600).

Almost surely, 2^80817639 is an apocalyptic number.

80817639 is a deficient number, since it is larger than the sum of its proper divisors (42983961).

80817639 is a wasteful number, since it uses less digits than its factorization.

80817639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20350.

The product of its (nonzero) digits is 72576, while the sum is 42.

The square root of 80817639 is about 8989.8631246532. The cubic root of 80817639 is about 432.3499233159.

The spelling of 80817639 in words is "eighty million, eight hundred seventeen thousand, six hundred thirty-nine".