31400261790 has 64 divisors (see below), whose sum is σ = 76695716160. Its totient is φ = 8225418240.

The previous prime is 31400261771. The next prime is 31400261831. The reversal of 31400261790 is 9716200413.

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, 1447746 + ... + 1469274.

It is an arithmetic number, because the mean of its divisors is an integer number (1198370565).

Almost surely, 2^31400261790 is an apocalyptic number.

31400261790 is a gapful number since it is divisible by the number (30) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 31400261790, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38347858080).

31400261790 is an abundant number, since it is smaller than the sum of its proper divisors (45295454370).

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

31400261790 is a wasteful number, since it uses less digits than its factorization.

31400261790 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22397.

The product of its (nonzero) digits is 9072, while the sum is 33.

The spelling of 31400261790 in words is "thirty-one billion, four hundred million, two hundred sixty-one thousand, seven hundred ninety".