31045871640 has 128 divisors (see below), whose sum is σ = 106514242560. Its totient is φ = 7091449344.

The previous prime is 31045871627. The next prime is 31045871711. The reversal of 31045871640 is 4617854013.

It is a super-2 number, since 2×31045871640² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1329909 + ... + 1353051.

It is an arithmetic number, because the mean of its divisors is an integer number (832142520).

Almost surely, 2^31045871640 is an apocalyptic number.

31045871640 is a gapful number since it is divisible by the number (30) 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 31045871640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (53257121280).

31045871640 is an abundant number, since it is smaller than the sum of its proper divisors (75468370920).

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

31045871640 is a wasteful number, since it uses less digits than its factorization.

31045871640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24761 (or 24757 counting only the distinct ones).

The product of its (nonzero) digits is 80640, while the sum is 39.

The spelling of 31045871640 in words is "thirty-one billion, forty-five million, eight hundred seventy-one thousand, six hundred forty".