80647749 has 48 divisors (see below), whose sum is σ = 145891200. Its totient is φ = 41793408.

The previous prime is 80647739. The next prime is 80647751. The reversal of 80647749 is 94774608.

It is not a de Polignac number, because 80647749 - 2⁴ = 80647733 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (80647739) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 47487 + ... + 49155.

It is an arithmetic number, because the mean of its divisors is an integer number (3039400).

Almost surely, 2^80647749 is an apocalyptic number.

It is an amenable number.

80647749 is a deficient number, since it is larger than the sum of its proper divisors (65243451).

80647749 is a wasteful number, since it uses less digits than its factorization.

80647749 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1754 (or 1751 counting only the distinct ones).

The product of its (nonzero) digits is 338688, while the sum is 45.

The square root of 80647749 is about 8980.4091777602. The cubic root of 80647749 is about 432.0467574133.

The spelling of 80647749 in words is "eighty million, six hundred forty-seven thousand, seven hundred forty-nine".