18378628 has 6 divisors (see below), whose sum is σ = 32162606. Its totient is φ = 9189312.

The previous prime is 18378623. The next prime is 18378631. The reversal of 18378628 is 82687381.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 10969344 + 7409284 = 3312^2 + 2722^2 .

It is not an unprimeable number, because it can be changed into a prime (18378623) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2297325 + ... + 2297332.

Almost surely, 2^18378628 is an apocalyptic number.

It is an amenable number.

18378628 is a deficient number, since it is larger than the sum of its proper divisors (13783978).

18378628 is a wasteful number, since it uses less digits than its factorization.

18378628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4594661 (or 4594659 counting only the distinct ones).

The product of its digits is 129024, while the sum is 43.

The square root of 18378628 is about 4287.0302074980. The cubic root of 18378628 is about 263.8989703718.

The spelling of 18378628 in words is "eighteen million, three hundred seventy-eight thousand, six hundred twenty-eight".