18228783420 has 72 divisors (see below), whose sum is σ = 55660244640. Its totient is φ = 4828809600.

The previous prime is 18228783413. The next prime is 18228783427. The reversal of 18228783420 is 2438782281.

18228783420 is a `hidden beast` number, since 18 + 228 + 78 + 342 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (18228783413) and next prime (18228783427).

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18228783427) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 308155 + ... + 362514.

Almost surely, 2^18228783420 is an apocalyptic number.

18228783420 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18228783420 is an abundant number, since it is smaller than the sum of its proper divisors (37431461220).

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

18228783420 is a wasteful number, since it uses less digits than its factorization.

18228783420 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 670835 (or 670830 counting only the distinct ones).

The product of its (nonzero) digits is 344064, while the sum is 45.

The spelling of 18228783420 in words is "eighteen billion, two hundred twenty-eight million, seven hundred eighty-three thousand, four hundred twenty".