80639144 has 16 divisors (see below), whose sum is σ = 151862100. Its totient is φ = 40142592.

The previous prime is 80639137. The next prime is 80639149. The reversal of 80639144 is 44193608.

It can be written as a sum of positive squares in 2 ways, for example, as 67404100 + 13235044 = 8210^2 + 3638^2 .

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (80639149) 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 3 ways as a sum of consecutive naturals, for example, 20177 + ... + 23840.

Almost surely, 2^80639144 is an apocalyptic number.

It is an amenable number.

80639144 is a deficient number, since it is larger than the sum of its proper divisors (71222956).

80639144 is a wasteful number, since it uses less digits than its factorization.

80639144 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44252 (or 44248 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 35.

The square root of 80639144 is about 8979.9300665428. The cubic root of 80639144 is about 432.0313906088.

The spelling of 80639144 in words is "eighty million, six hundred thirty-nine thousand, one hundred forty-four".