1990371888 has 60 divisors (see below), whose sum is σ = 5591093040. Its totient is φ = 660978048.

The previous prime is 1990371871. The next prime is 1990371913. The reversal of 1990371888 is 8881730991.

1990371888 is a `hidden beast` number, since 199 + 0 + 371 + 8 + 88 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 13045 + ... + 64427.

It is an arithmetic number, because the mean of its divisors is an integer number (93184884).

Almost surely, 2^1990371888 is an apocalyptic number.

1990371888 is a gapful number since it is divisible by the number (18) 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 1990371888, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2795546520).

1990371888 is an abundant number, since it is smaller than the sum of its proper divisors (3600721152).

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

1990371888 is a wasteful number, since it uses less digits than its factorization.

1990371888 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51666 (or 51657 counting only the distinct ones).

The product of its (nonzero) digits is 870912, while the sum is 54.

The square root of 1990371888 is about 44613.5841196378. The cubic root of 1990371888 is about 1257.8960200445.

The spelling of 1990371888 in words is "one billion, nine hundred ninety million, three hundred seventy-one thousand, eight hundred eighty-eight".