18879947028 has 36 divisors (see below), whose sum is σ = 47776324960. Its totient is φ = 6286456656.

The previous prime is 18879947027. The next prime is 18879947029. The reversal of 18879947028 is 82074997881.

It is an interprime number because it is at equal distance from previous prime (18879947027) and next prime (18879947029).

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18879947027) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 252250 + ... + 318417.

Almost surely, 2^18879947028 is an apocalyptic number.

18879947028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18879947028 is an abundant number, since it is smaller than the sum of its proper divisors (28896377932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18879947028 is a wasteful number, since it uses less digits than its factorization.

18879947028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 571596 (or 571591 counting only the distinct ones).

The product of its (nonzero) digits is 16257024, while the sum is 63.

The spelling of 18879947028 in words is "eighteen billion, eight hundred seventy-nine million, nine hundred forty-seven thousand, twenty-eight".