40445501820 has 96 divisors (see below), whose sum is σ = 115254316800. Its totient is φ = 10594612224.

The previous prime is 40445501689. The next prime is 40445501843. The reversal of 40445501820 is 2810554404.

It is a happy number.

It is a congruent number.

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, 5727732 + ... + 5734788.

It is an arithmetic number, because the mean of its divisors is an integer number (1200565800).

Almost surely, 2^40445501820 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 40445501820, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (57627158400).

40445501820 is an abundant number, since it is smaller than the sum of its proper divisors (74808814980).

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

40445501820 is a wasteful number, since it uses less digits than its factorization.

40445501820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8747 (or 8745 counting only the distinct ones).

The product of its (nonzero) digits is 25600, while the sum is 33.

The spelling of 40445501820 in words is "forty billion, four hundred forty-five million, five hundred one thousand, eight hundred twenty".