80731739 has 4 divisors (see below), whose sum is σ = 88071000. Its totient is φ = 73392480.

The previous prime is 80731733. The next prime is 80731753. The reversal of 80731739 is 93713708.

It is a happy number.

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 80731739 - 2⁴ = 80731723 is a prime.

It is a super-2 number, since 2×80731739² = 13035227363928242, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (80731733) 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, 3669614 + ... + 3669635.

It is an arithmetic number, because the mean of its divisors is an integer number (22017750).

Almost surely, 2^80731739 is an apocalyptic number.

80731739 is a deficient number, since it is larger than the sum of its proper divisors (7339261).

80731739 is a wasteful number, since it uses less digits than its factorization.

80731739 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7339260.

The product of its (nonzero) digits is 31752, while the sum is 38.

The square root of 80731739 is about 8985.0842511353. The cubic root of 80731739 is about 432.1966893405.

The spelling of 80731739 in words is "eighty million, seven hundred thirty-one thousand, seven hundred thirty-nine".