44521640 has 64 divisors (see below), whose sum is σ = 106900560. Its totient is φ = 16629760.

The previous prime is 44521639. The next prime is 44521649. The reversal of 44521640 is 4612544.

It can be written as a sum of positive squares in 8 ways, for example, as 22600516 + 21921124 = 4754^2 + 4682^2 .

It is not an unprimeable number, because it can be changed into a prime (44521649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 158300 + ... + 158580.

Almost surely, 2^44521640 is an apocalyptic number.

44521640 is a gapful number since it is divisible by the number (40) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 44521640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53450280).

44521640 is an abundant number, since it is smaller than the sum of its proper divisors (62378920).

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

44521640 is a wasteful number, since it uses less digits than its factorization.

44521640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 542 (or 538 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 26.

The square root of 44521640 is about 6672.4538214963. The cubic root of 44521640 is about 354.4244857366.

The spelling of 44521640 in words is "forty-four million, five hundred twenty-one thousand, six hundred forty".