190788778906 has 32 divisors (see below), whose sum is σ = 314383156416. Its totient is φ = 86117808000.

The previous prime is 190788778883. The next prime is 190788778927. The reversal of 190788778906 is 609877887091.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1758661 + ... + 1863991.

It is an arithmetic number, because the mean of its divisors is an integer number (9824473638).

Almost surely, 2^190788778906 is an apocalyptic number.

190788778906 is a deficient number, since it is larger than the sum of its proper divisors (123594377510).

190788778906 is a wasteful number, since it uses less digits than its factorization.

190788778906 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105918.

The product of its (nonzero) digits is 85349376, while the sum is 70.

The spelling of 190788778906 in words is "one hundred ninety billion, seven hundred eighty-eight million, seven hundred seventy-eight thousand, nine hundred six".