80749989 has 6 divisors (see below), whose sum is σ = 116638886. Its totient is φ = 53833320.

The previous prime is 80749979. The next prime is 80749993. The reversal of 80749989 is 98994708.

It can be written as a sum of positive squares in only one way, i.e., 79388100 + 1361889 = 8910^2 + 1167^2 .

It is not a de Polignac number, because 80749989 - 2⁸ = 80749733 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80749979) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4486102 + ... + 4486119.

Almost surely, 2^80749989 is an apocalyptic number.

It is an amenable number.

80749989 is a deficient number, since it is larger than the sum of its proper divisors (35888897).

80749989 is a wasteful number, since it uses less digits than its factorization.

80749989 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8972227 (or 8972224 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The square root of 80749989 is about 8986.0997657493. The cubic root of 80749989 is about 432.2292539609.

The spelling of 80749989 in words is "eighty million, seven hundred forty-nine thousand, nine hundred eighty-nine".