990188775 has 18 divisors (see below), whose sum is σ = 1773538520. Its totient is φ = 528100560.

The previous prime is 990188767. The next prime is 990188803. The reversal of 990188775 is 577881099.

990188775 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 990188775 - 2³ = 990188767 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 2200195 + ... + 2200644.

Almost surely, 2^990188775 is an apocalyptic number.

990188775 is a deficient number, since it is larger than the sum of its proper divisors (783349745).

990188775 is a wasteful number, since it uses less digits than its factorization.

990188775 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4400855 (or 4400847 counting only the distinct ones).

The product of its (nonzero) digits is 1270080, while the sum is 54.

The square root of 990188775 is about 31467.2651337863. The cubic root of 990188775 is about 996.7188374138.

The spelling of 990188775 in words is "nine hundred ninety million, one hundred eighty-eight thousand, seven hundred seventy-five".