18028663280 has 20 divisors (see below), whose sum is σ = 41916642312. Its totient is φ = 7211465280.

The previous prime is 18028663249. The next prime is 18028663283. The reversal of 18028663280 is 8236682081.

It is a tau number, because it is divible by the number of its divisors (20).

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18028663283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 112679066 + ... + 112679225.

Almost surely, 2^18028663280 is an apocalyptic number.

18028663280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18028663280 is an abundant number, since it is smaller than the sum of its proper divisors (23887979032).

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

18028663280 is a wasteful number, since it uses less digits than its factorization.

18028663280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 225358304 (or 225358298 counting only the distinct ones).

The product of its (nonzero) digits is 221184, while the sum is 44.

The spelling of 18028663280 in words is "eighteen billion, twenty-eight million, six hundred sixty-three thousand, two hundred eighty".