18775280 has 40 divisors (see below), whose sum is σ = 44839392. Its totient is φ = 7305984.

The previous prime is 18775279. The next prime is 18775283. The reversal of 18775280 is 8257781.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×18775280² = 705022278156800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18775283) 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, 212 + ... + 6131.

Almost surely, 2^18775280 is an apocalyptic number.

18775280 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 18775280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22419696).

18775280 is an abundant number, since it is smaller than the sum of its proper divisors (26064112).

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

18775280 is a wasteful number, since it uses less digits than its factorization.

18775280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6393 (or 6387 counting only the distinct ones).

The product of its (nonzero) digits is 31360, while the sum is 38.

The square root of 18775280 is about 4333.0451186204. The cubic root of 18775280 is about 265.7839842707.

The spelling of 18775280 in words is "eighteen million, seven hundred seventy-five thousand, two hundred eighty".