1990786875 has 80 divisors (see below), whose sum is σ = 4135676160. Its totient is φ = 827280000.

The previous prime is 1990786871. The next prime is 1990786913. The reversal of 1990786875 is 5786870991.

It is not a de Polignac number, because 1990786875 - 2² = 1990786871 is a prime.

It is a Smith number, since the sum of its digits (60) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1990786871) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 137481 + ... + 151269.

It is an arithmetic number, because the mean of its divisors is an integer number (51695952).

Almost surely, 2^1990786875 is an apocalyptic number.

1990786875 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

1990786875 is an abundant number, since it is smaller than the sum of its proper divisors (2144889285).

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

1990786875 is a wasteful number, since it uses less digits than its factorization.

1990786875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13830 (or 13815 counting only the distinct ones).

The product of its (nonzero) digits is 7620480, while the sum is 60.

The square root of 1990786875 is about 44618.2347813089. The cubic root of 1990786875 is about 1257.9834365760.

The spelling of 1990786875 in words is "one billion, nine hundred ninety million, seven hundred eighty-six thousand, eight hundred seventy-five".