31477782040 has 64 divisors (see below), whose sum is σ = 73404144000. Its totient is φ = 12134223360.

The previous prime is 31477781987. The next prime is 31477782047. The reversal of 31477782040 is 4028777413.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31477782047) 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, 602481 + ... + 652639.

It is an arithmetic number, because the mean of its divisors is an integer number (1146939750).

Almost surely, 2^31477782040 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 31477782040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36702072000).

31477782040 is an abundant number, since it is smaller than the sum of its proper divisors (41926361960).

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

31477782040 is a wasteful number, since it uses less digits than its factorization.

31477782040 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 50740 (or 50736 counting only the distinct ones).

The product of its (nonzero) digits is 263424, while the sum is 43.

The spelling of 31477782040 in words is "thirty-one billion, four hundred seventy-seven million, seven hundred eighty-two thousand, forty".