44644640 has 24 divisors (see below), whose sum is σ = 105473340. Its totient is φ = 17857792.

The previous prime is 44644637. The next prime is 44644657. The reversal of 44644640 is 4644644.

It can be written as a sum of positive squares in 2 ways, for example, as 36048016 + 8596624 = 6004^2 + 2932^2 .

It is a Harshad number since it is a multiple of its sum of digits (32).

It is a junction number, because it is equal to n+sod(n) for n = 44644597 and 44644606.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 139355 + ... + 139674.

Almost surely, 2^44644640 is an apocalyptic number.

44644640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

44644640 is an abundant number, since it is smaller than the sum of its proper divisors (60828700).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

44644640 is a wasteful number, since it uses less digits than its factorization.

44644640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279044 (or 279036 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 32.

The square root of 44644640 is about 6681.6644632906. The cubic root of 44644640 is about 354.7505753065.

The spelling of 44644640 in words is "forty-four million, six hundred forty-four thousand, six hundred forty".