80390691 has 16 divisors (see below), whose sum is σ = 125366400. Its totient is φ = 50772744.

The previous prime is 80390683. The next prime is 80390699. The reversal of 80390691 is 19609308.

It is an interprime number because it is at equal distance from previous prime (80390683) and next prime (80390699).

It is not a de Polignac number, because 80390691 - 2³ = 80390683 is a prime.

It is not an unprimeable number, because it can be changed into a prime (80390699) 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, 77841 + ... + 78866.

It is an arithmetic number, because the mean of its divisors is an integer number (7835400).

Almost surely, 2^80390691 is an apocalyptic number.

80390691 is a deficient number, since it is larger than the sum of its proper divisors (44975709).

80390691 is a wasteful number, since it uses less digits than its factorization.

80390691 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156735 (or 156729 counting only the distinct ones).

The product of its (nonzero) digits is 11664, while the sum is 36.

The square root of 80390691 is about 8966.0856007513. The cubic root of 80390691 is about 431.5872311175.

Adding to 80390691 its reverse (19609308), we get a palindrome (99999999).

The spelling of 80390691 in words is "eighty million, three hundred ninety thousand, six hundred ninety-one".