18748280 has 64 divisors (see below), whose sum is σ = 45360000. Its totient is φ = 6948864.

The previous prime is 18748277. The next prime is 18748333. The reversal of 18748280 is 8284781.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 53546 + ... + 53894.

It is an arithmetic number, because the mean of its divisors is an integer number (708750).

Almost surely, 2^18748280 is an apocalyptic number.

18748280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18748280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22680000).

18748280 is an abundant number, since it is smaller than the sum of its proper divisors (26611720).

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

18748280 is a wasteful number, since it uses less digits than its factorization.

18748280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 456 (or 452 counting only the distinct ones).

The product of its (nonzero) digits is 28672, while the sum is 38.

The square root of 18748280 is about 4329.9284058746. The cubic root of 18748280 is about 265.6565186128.

The spelling of 18748280 in words is "eighteen million, seven hundred forty-eight thousand, two hundred eighty".