40044896640 has 640 divisors, whose sum is σ = 164525771520. Its totient is φ = 9092321280.

The previous prime is 40044896501. The next prime is 40044896653. The reversal of 40044896640 is 4669844004.

It is a tau number, because it is divible by the number of its divisors (640).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 76567419 + ... + 76567941.

It is an arithmetic number, because the mean of its divisors is an integer number (257071518).

Almost surely, 2^40044896640 is an apocalyptic number.

40044896640 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 40044896640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82262885760).

40044896640 is an abundant number, since it is smaller than the sum of its proper divisors (124480874880).

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

40044896640 is a wasteful number, since it uses less digits than its factorization.

40044896640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 772 (or 751 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 45.

The spelling of 40044896640 in words is "forty billion, forty-four million, eight hundred ninety-six thousand, six hundred forty".