40644172240 has 160 divisors (see below), whose sum is σ = 113992704000. Its totient is φ = 13165576704.

The previous prime is 40644172211. The next prime is 40644172241. The reversal of 40644172240 is 4227144604.

40644172240 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 40644172196 and 40644172205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (40644172241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4027521 + ... + 4037599.

It is an arithmetic number, because the mean of its divisors is an integer number (712454400).

Almost surely, 2^40644172240 is an apocalyptic number.

40644172240 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 40644172240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (56996352000).

40644172240 is an abundant number, since it is smaller than the sum of its proper divisors (73348531760).

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

40644172240 is a wasteful number, since it uses less digits than its factorization.

40644172240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10497 (or 10491 counting only the distinct ones).

The product of its (nonzero) digits is 43008, while the sum is 34.

The spelling of 40644172240 in words is "forty billion, six hundred forty-four million, one hundred seventy-two thousand, two hundred forty".