28681901930 has 16 divisors (see below), whose sum is σ = 56320825824. Its totient is φ = 10429782480.

The previous prime is 28681901923. The next prime is 28681901981. The reversal of 28681901930 is 3910918682.

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, 130372172 + ... + 130372391.

It is an arithmetic number, because the mean of its divisors is an integer number (3520051614).

Almost surely, 2^28681901930 is an apocalyptic number.

28681901930 is a deficient number, since it is larger than the sum of its proper divisors (27638923894).

28681901930 is a wasteful number, since it uses less digits than its factorization.

28681901930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260744581.

The product of its (nonzero) digits is 186624, while the sum is 47.

The spelling of 28681901930 in words is "twenty-eight billion, six hundred eighty-one million, nine hundred one thousand, nine hundred thirty".