18672228 has 48 divisors (see below), whose sum is σ = 50520960. Its totient is φ = 5952672.

The previous prime is 18672221. The next prime is 18672253. The reversal of 18672228 is 82227681.

It is a happy number.

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 = 18672192 and 18672201.

It is not an unprimeable number, because it can be changed into a prime (18672221) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1275 + ... + 6242.

It is an arithmetic number, because the mean of its divisors is an integer number (1052520).

Almost surely, 2^18672228 is an apocalyptic number.

18672228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18672228 is an abundant number, since it is smaller than the sum of its proper divisors (31848732).

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

18672228 is a wasteful number, since it uses less digits than its factorization.

18672228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7553 (or 7545 counting only the distinct ones).

The product of its digits is 21504, while the sum is 36.

The square root of 18672228 is about 4321.1373502818. The cubic root of 18672228 is about 265.2968217958.

It can be divided in two parts, 1867 and 2228, that added together give a triangular number (4095 = T₉₀).

The spelling of 18672228 in words is "eighteen million, six hundred seventy-two thousand, two hundred twenty-eight".