18783380490 has 128 divisors (see below), whose sum is σ = 52285685760. Its totient is φ = 4229791488.

The previous prime is 18783380459. The next prime is 18783380507. The reversal of 18783380490 is 9408338781.

It is a super-2 number, since 2×18783380490² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 10168747 + ... + 10170593.

It is an arithmetic number, because the mean of its divisors is an integer number (408481920).

Almost surely, 2^18783380490 is an apocalyptic number.

18783380490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18783380490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26142842880).

18783380490 is an abundant number, since it is smaller than the sum of its proper divisors (33502305270).

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

18783380490 is a wasteful number, since it uses less digits than its factorization.

18783380490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2556.

The product of its (nonzero) digits is 1161216, while the sum is 51.

The spelling of 18783380490 in words is "eighteen billion, seven hundred eighty-three million, three hundred eighty thousand, four hundred ninety".