30686231990 has 16 divisors (see below), whose sum is σ = 58484348352. Its totient is φ = 11552463744.

The previous prime is 30686231911. The next prime is 30686232013. The reversal of 30686231990 is 9913268603.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 90253454 + ... + 90253793.

It is an arithmetic number, because the mean of its divisors is an integer number (3655271772).

Almost surely, 2^30686231990 is an apocalyptic number.

30686231990 is a deficient number, since it is larger than the sum of its proper divisors (27798116362).

30686231990 is a wasteful number, since it uses less digits than its factorization.

30686231990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 180507271.

The product of its (nonzero) digits is 419904, while the sum is 47.

The spelling of 30686231990 in words is "thirty billion, six hundred eighty-six million, two hundred thirty-one thousand, nine hundred ninety".