190664505 has 12 divisors (see below), whose sum is σ = 330485220. Its totient is φ = 101687712.

The previous prime is 190664501. The next prime is 190664519. The reversal of 190664505 is 505466091.

190664505 is a `hidden beast` number, since 1 + 9 + 0 + 6 + 645 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 96884649 + 93779856 = 9843^2 + 9684^2 .

It is not a de Polignac number, because 190664505 - 2² = 190664501 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 190664505.

It is not an unprimeable number, because it can be changed into a prime (190664501) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 2118450 + ... + 2118539.

It is an arithmetic number, because the mean of its divisors is an integer number (27540435).

Almost surely, 2^190664505 is an apocalyptic number.

190664505 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

190664505 is a deficient number, since it is larger than the sum of its proper divisors (139820715).

190664505 is a wasteful number, since it uses less digits than its factorization.

190664505 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4237000 (or 4236997 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 36.

The square root of 190664505 is about 13808.1318432292. The cubic root of 190664505 is about 575.5591334977.

The spelling of 190664505 in words is "one hundred ninety million, six hundred sixty-four thousand, five hundred five".