31023220029990 has 128 divisors (see below), whose sum is σ = 78629049492480. Its totient is φ = 7833706007040.

The previous prime is 31023220029917. The next prime is 31023220030039. The reversal of 31023220029990 is 9992002232013.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 444634087 + ... + 444703853.

It is an arithmetic number, because the mean of its divisors is an integer number (614289449160).

Almost surely, 2^{31023220029990} is an apocalyptic number.

31023220029990 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 31023220029990, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39314524746240).

31023220029990 is an abundant number, since it is smaller than the sum of its proper divisors (47605829462490).

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

31023220029990 is a wasteful number, since it uses less digits than its factorization.

31023220029990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71995 (or 71957 counting only the distinct ones).

The product of its (nonzero) digits is 104976, while the sum is 42.

The spelling of 31023220029990 in words is "thirty-one trillion, twenty-three billion, two hundred twenty million, twenty-nine thousand, nine hundred ninety".