40531031620 has 48 divisors (see below), whose sum is σ = 88377836400. Its totient is φ = 15595112960.

The previous prime is 40531031581. The next prime is 40531031621. The reversal of 40531031620 is 2613013504.

It can be written as a sum of positive squares in 8 ways, for example, as 14596505856 + 25934525764 = 120816^2 + 161042^2 .

It is not an unprimeable number, because it can be changed into a prime (40531031621) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26130 + ... + 285910.

It is an arithmetic number, because the mean of its divisors is an integer number (1841204925).

Almost surely, 2^40531031620 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 40531031620, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44188918200).

40531031620 is an abundant number, since it is smaller than the sum of its proper divisors (47846804780).

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

40531031620 is a wasteful number, since it uses less digits than its factorization.

40531031620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260088 (or 260086 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 25.

The spelling of 40531031620 in words is "forty billion, five hundred thirty-one million, thirty-one thousand, six hundred twenty".