31898011896 has 160 divisors (see below), whose sum is σ = 90396641280. Its totient is φ = 10508097600.

The previous prime is 31898011877. The next prime is 31898011907. The reversal of 31898011896 is 69811089813.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 39 ways as a sum of consecutive naturals, for example, 27239391 + ... + 27240561.

It is an arithmetic number, because the mean of its divisors is an integer number (564979008).

Almost surely, 2^31898011896 is an apocalyptic number.

31898011896 is a gapful number since it is divisible by the number (36) 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 31898011896, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45198320640).

31898011896 is an abundant number, since it is smaller than the sum of its proper divisors (58498629384).

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

31898011896 is a wasteful number, since it uses less digits than its factorization.

31898011896 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1647 (or 1634 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 54.

The spelling of 31898011896 in words is "thirty-one billion, eight hundred ninety-eight million, eleven thousand, eight hundred ninety-six".