18428868 has 36 divisors (see below), whose sum is σ = 46715760. Its totient is φ = 6125616.

The previous prime is 18428857. The next prime is 18428869. The reversal of 18428868 is 86882481.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×18428868² = 679246351522848, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18428869) 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 in 11 ways as a sum of consecutive naturals, for example, 21871 + ... + 22697.

It is an arithmetic number, because the mean of its divisors is an integer number (1297660).

Almost surely, 2^18428868 is an apocalyptic number.

18428868 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18428868 is an abundant number, since it is smaller than the sum of its proper divisors (28286892).

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

18428868 is a wasteful number, since it uses less digits than its factorization.

18428868 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456 (or 1451 counting only the distinct ones).

The product of its digits is 196608, while the sum is 45.

The square root of 18428868 is about 4292.8857427143. The cubic root of 18428868 is about 264.1392172062.

The spelling of 18428868 in words is "eighteen million, four hundred twenty-eight thousand, eight hundred sixty-eight".