44591881536 has 140 divisors (see below), whose sum is σ = 132461081280. Its totient is φ = 14832840960.

The previous prime is 44591881513. The next prime is 44591881541. The reversal of 44591881536 is 63518819544.

It is a happy number.

44591881536 is a `hidden beast` number, since 4 + 4 + 591 + 8 + 8 + 15 + 36 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 2536585 + ... + 2554103.

Almost surely, 2^44591881536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 44591881536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (66230540640).

44591881536 is an abundant number, since it is smaller than the sum of its proper divisors (87869199744).

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

44591881536 is a wasteful number, since it uses less digits than its factorization.

44591881536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18034 (or 18015 counting only the distinct ones).

The product of its digits is 4147200, while the sum is 54.

The spelling of 44591881536 in words is "forty-four billion, five hundred ninety-one million, eight hundred eighty-one thousand, five hundred thirty-six".