31898697120 has 144 divisors (see below), whose sum is σ = 108900864072. Its totient is φ = 8502681600.

The previous prime is 31898697109. The next prime is 31898697137. The reversal of 31898697120 is 2179689813.

It can be written as a sum of positive squares in 4 ways, for example, as 17420832144 + 14477864976 = 131988^2 + 120324^2 .

It is a tau number, because it is divible by the number of its divisors (144).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6046804 + ... + 6052076.

Almost surely, 2^31898697120 is an apocalyptic number.

31898697120 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 31898697120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54450432036).

31898697120 is an abundant number, since it is smaller than the sum of its proper divisors (77002166952).

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

31898697120 is a wasteful number, since it uses less digits than its factorization.

31898697120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9495 (or 9484 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 31898697120 in words is "thirty-one billion, eight hundred ninety-eight million, six hundred ninety-seven thousand, one hundred twenty".