18274640688 has 200 divisors, whose sum is σ = 56554157088. Its totient is φ = 5676853248.

The previous prime is 18274640669. The next prime is 18274640689. The reversal of 18274640688 is 88604647281.

It is a super-2 number, since 2×18274640688² (a number of 21 digits) contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (18274640689) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 2265270 + ... + 2273322.

Almost surely, 2^18274640688 is an apocalyptic number.

18274640688 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 18274640688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28277078544).

18274640688 is an abundant number, since it is smaller than the sum of its proper divisors (38279516400).

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

18274640688 is a wasteful number, since it uses less digits than its factorization.

18274640688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8193 (or 8178 counting only the distinct ones).

The product of its (nonzero) digits is 4128768, while the sum is 54.

The spelling of 18274640688 in words is "eighteen billion, two hundred seventy-four million, six hundred forty thousand, six hundred eighty-eight".