18228672090 has 48 divisors (see below), whose sum is σ = 48171521736. Its totient is φ = 4781289600.

The previous prime is 18228672079. The next prime is 18228672107. The reversal of 18228672090 is 9027682281.

It can be written as a sum of positive squares in 4 ways, for example, as 9129229209 + 9099442881 = 95547^2 + 95391^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1654681 + ... + 1665660.

Almost surely, 2^18228672090 is an apocalyptic number.

18228672090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18228672090 is an abundant number, since it is smaller than the sum of its proper divisors (29942849646).

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

18228672090 is a wasteful number, since it uses less digits than its factorization.

18228672090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3320415 (or 3320412 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The spelling of 18228672090 in words is "eighteen billion, two hundred twenty-eight million, six hundred seventy-two thousand, ninety".