18828780 has 96 divisors (see below), whose sum is σ = 55738368. Its totient is φ = 4742400.

The previous prime is 18828773. The next prime is 18828787. The reversal of 18828780 is 8782881.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18828773) and next prime (18828787).

It is not an unprimeable number, because it can be changed into a prime (18828787) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 98485 + ... + 98675.

It is an arithmetic number, because the mean of its divisors is an integer number (580608).

Almost surely, 2^18828780 is an apocalyptic number.

18828780 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 18828780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27869184).

18828780 is an abundant number, since it is smaller than the sum of its proper divisors (36909588).

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

18828780 is a wasteful number, since it uses less digits than its factorization.

18828780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287 (or 285 counting only the distinct ones).

The product of its (nonzero) digits is 57344, while the sum is 42.

The square root of 18828780 is about 4339.2142145785. The cubic root of 18828780 is about 266.0361945961.

The spelling of 18828780 in words is "eighteen million, eight hundred twenty-eight thousand, seven hundred eighty".