44640081 has 12 divisors (see below), whose sum is σ = 65119860. Its totient is φ = 29464800.

The previous prime is 44640073. The next prime is 44640091. The reversal of 44640081 is 18004644.

It can be written as a sum of positive squares in 2 ways, for example, as 26873856 + 17766225 = 5184^2 + 4215^2 .

It is not a de Polignac number, because 44640081 - 2³ = 44640073 is a prime.

It is a super-2 number, since 2×44640081² = 3985473663373122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (44640061) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 23646 + ... + 25463.

It is an arithmetic number, because the mean of its divisors is an integer number (5426655).

Almost surely, 2^44640081 is an apocalyptic number.

It is an amenable number.

44640081 is a deficient number, since it is larger than the sum of its proper divisors (20479779).

44640081 is a wasteful number, since it uses less digits than its factorization.

44640081 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49216 (or 49213 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 44640081 is about 6681.3232970722. The cubic root of 44640081 is about 354.7384994789.

The spelling of 44640081 in words is "forty-four million, six hundred forty thousand, eighty-one".