18278028 has 24 divisors (see below), whose sum is σ = 47387760. Its totient is φ = 6092640.

The previous prime is 18278021. The next prime is 18278041. The reversal of 18278028 is 82087281.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 18277983 and 18278001.

It is not an unprimeable number, because it can be changed into a prime (18278021) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 84513 + ... + 84728.

It is an arithmetic number, because the mean of its divisors is an integer number (1974490).

Almost surely, 2^18278028 is an apocalyptic number.

18278028 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18278028 is an abundant number, since it is smaller than the sum of its proper divisors (29109732).

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

18278028 is a wasteful number, since it uses less digits than its factorization.

18278028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169254 (or 169246 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 18278028 is about 4275.2810433935. The cubic root of 18278028 is about 263.4165835523.

It can be divided in two parts, 182 and 78028, that added together give a triangular number (78210 = T₃₉₅).

The spelling of 18278028 in words is "eighteen million, two hundred seventy-eight thousand, twenty-eight".