18291986730 has 128 divisors (see below), whose sum is σ = 49217414400. Its totient is φ = 4834195200.

The previous prime is 18291986711. The next prime is 18291986747. The reversal of 18291986730 is 3768919281.

It is a Harshad number since it is a multiple of its sum of digits (54).

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, 22279720 + ... + 22280540.

It is an arithmetic number, because the mean of its divisors is an integer number (384511050).

Almost surely, 2^18291986730 is an apocalyptic number.

18291986730 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 18291986730, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24608707200).

18291986730 is an abundant number, since it is smaller than the sum of its proper divisors (30925427670).

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

18291986730 is a wasteful number, since it uses less digits than its factorization.

18291986730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1477 (or 1471 counting only the distinct ones).

The product of its (nonzero) digits is 1306368, while the sum is 54.

The spelling of 18291986730 in words is "eighteen billion, two hundred ninety-one million, nine hundred eighty-six thousand, seven hundred thirty".