18817427490 has 192 divisors, whose sum is σ = 49109172480. Its totient is φ = 4608038400.

The previous prime is 18817427479. The next prime is 18817427543. The reversal of 18817427490 is 9472471881.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 59360812 + ... + 59361128.

It is an arithmetic number, because the mean of its divisors is an integer number (255776940).

Almost surely, 2^18817427490 is an apocalyptic number.

18817427490 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 18817427490, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (24554586240).

18817427490 is an abundant number, since it is smaller than the sum of its proper divisors (30291744990).

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

18817427490 is a wasteful number, since it uses less digits than its factorization.

18817427490 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489 (or 458 counting only the distinct ones).

The product of its (nonzero) digits is 903168, while the sum is 51.

The spelling of 18817427490 in words is "eighteen billion, eight hundred seventeen million, four hundred twenty-seven thousand, four hundred ninety".