18490747968 has 336 divisors, whose sum is σ = 66887847936. Its totient is φ = 4743982080.

The previous prime is 18490747963. The next prime is 18490747981. The reversal of 18490747968 is 86974709481.

18490747968 is a `hidden beast` number, since 1 + 8 + 490 + 74 + 79 + 6 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (336).

It is a super-2 number, since 2×18490747968² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (18490747963) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3678705 + ... + 3683727.

It is an arithmetic number, because the mean of its divisors is an integer number (199070976).

Almost surely, 2^18490747968 is an apocalyptic number.

18490747968 is a gapful number since it is divisible by the number (18) 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 18490747968, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33443923968).

18490747968 is an abundant number, since it is smaller than the sum of its proper divisors (48397099968).

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

18490747968 is a wasteful number, since it uses less digits than its factorization.

18490747968 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5142 (or 5129 counting only the distinct ones).

The product of its (nonzero) digits is 24385536, while the sum is 63.

The spelling of 18490747968 in words is "eighteen billion, four hundred ninety million, seven hundred forty-seven thousand, nine hundred sixty-eight".