44990561640 has 128 divisors (see below), whose sum is σ = 141405880320. Its totient is φ = 11437113600.

The previous prime is 44990561639. The next prime is 44990561669. The reversal of 44990561640 is 4616509944.

It is a self number, because there is not a number n which added to its sum of digits gives 44990561640.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 158985 + ... + 339495.

It is an arithmetic number, because the mean of its divisors is an integer number (1104733440).

Almost surely, 2^44990561640 is an apocalyptic number.

44990561640 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 44990561640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (70702940160).

44990561640 is an abundant number, since it is smaller than the sum of its proper divisors (96415318680).

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

44990561640 is a wasteful number, since it uses less digits than its factorization.

44990561640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180623 (or 180619 counting only the distinct ones).

The product of its (nonzero) digits is 933120, while the sum is 48.

The spelling of 44990561640 in words is "forty-four billion, nine hundred ninety million, five hundred sixty-one thousand, six hundred forty".