40003521620 has 144 divisors (see below), whose sum is σ = 90541463040. Its totient is φ = 14826502656.

The previous prime is 40003521601. The next prime is 40003521637. The reversal of 40003521620 is 2612530004.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 65903357 + ... + 65903963.

It is an arithmetic number, because the mean of its divisors is an integer number (628760160).

Almost surely, 2^40003521620 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 40003521620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45270731520).

40003521620 is an abundant number, since it is smaller than the sum of its proper divisors (50537941420).

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

40003521620 is a wasteful number, since it uses less digits than its factorization.

40003521620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 802 (or 763 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 23.

The spelling of 40003521620 in words is "forty billion, three million, five hundred twenty-one thousand, six hundred twenty".