80872749 has 10 divisors (see below), whose sum is σ = 120810030. Its totient is φ = 53915112.

The previous prime is 80872739. The next prime is 80872777. The reversal of 80872749 is 94727808.

It can be written as a sum of positive squares in only one way, i.e., 41409225 + 39463524 = 6435^2 + 6282^2 .

It is not a de Polignac number, because 80872749 - 2⁴ = 80872733 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80872739) 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 9 ways as a sum of consecutive naturals, for example, 499134 + ... + 499295.

It is an arithmetic number, because the mean of its divisors is an integer number (12081003).

Almost surely, 2^80872749 is an apocalyptic number.

It is an amenable number.

80872749 is a deficient number, since it is larger than the sum of its proper divisors (39937281).

80872749 is an equidigital number, since it uses as much as digits as its factorization.

80872749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 998441 (or 998432 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 80872749 is about 8992.9277212708. The cubic root of 80872749 is about 432.4481749300.

The spelling of 80872749 in words is "eighty million, eight hundred seventy-two thousand, seven hundred forty-nine".