188020090 has 16 divisors (see below), whose sum is σ = 343488672. Its totient is φ = 74085264.

The previous prime is 188020081. The next prime is 188020109. The reversal of 188020090 is 90020881.

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 7 ways as a sum of consecutive naturals, for example, 139644 + ... + 140983.

It is an arithmetic number, because the mean of its divisors is an integer number (21468042).

Almost surely, 2^188020090 is an apocalyptic number.

188020090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

188020090 is a deficient number, since it is larger than the sum of its proper divisors (155468582).

188020090 is a wasteful number, since it uses less digits than its factorization.

188020090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 280701.

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 188020090 is about 13712.0417881510. The cubic root of 188020090 is about 572.8858366631.

The spelling of 188020090 in words is "one hundred eighty-eight million, twenty thousand, ninety".