18778560 has 112 divisors (see below), whose sum is σ = 61642752. Its totient is φ = 4838400.

The previous prime is 18778519. The next prime is 18778561. The reversal of 18778560 is 6587781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18778561) 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, 29445 + ... + 30075.

Almost surely, 2^18778560 is an apocalyptic number.

18778560 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 18778560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30821376).

18778560 is an abundant number, since it is smaller than the sum of its proper divisors (42864192).

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

18778560 is a wasteful number, since it uses less digits than its factorization.

18778560 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 682 (or 672 counting only the distinct ones).

The product of its (nonzero) digits is 94080, while the sum is 42.

The square root of 18778560 is about 4333.4235888037. The cubic root of 18778560 is about 265.7994606614.

The spelling of 18778560 in words is "eighteen million, seven hundred seventy-eight thousand, five hundred sixty".