18791019628 has 48 divisors (see below), whose sum is σ = 33632988480. Its totient is φ = 9184665600.

The previous prime is 18791019623. The next prime is 18791019707. The reversal of 18791019628 is 82691019781.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (18791019623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12435393 + ... + 12436903.

It is an arithmetic number, because the mean of its divisors is an integer number (700687260).

Almost surely, 2^18791019628 is an apocalyptic number.

It is an amenable number.

18791019628 is a deficient number, since it is larger than the sum of its proper divisors (14841968852).

18791019628 is a wasteful number, since it uses less digits than its factorization.

18791019628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1978 (or 1976 counting only the distinct ones).

The product of its (nonzero) digits is 435456, while the sum is 52.

The spelling of 18791019628 in words is "eighteen billion, seven hundred ninety-one million, nineteen thousand, six hundred twenty-eight".