18531072000 has 768 divisors, whose sum is σ = 78498201600. Its totient is φ = 4224614400.

The previous prime is 18531071987. The next prime is 18531072011. The reversal of 18531072000 is 27013581.

It is a tau number, because it is divible by the number of its divisors (768).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

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, 48383809 + ... + 48384191.

It is an arithmetic number, because the mean of its divisors is an integer number (102211200).

Almost surely, 2^18531072000 is an apocalyptic number.

18531072000 is a gapful number since it is divisible by the number (10) 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 18531072000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (39249100800).

18531072000 is an abundant number, since it is smaller than the sum of its proper divisors (59967129600).

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

18531072000 is an equidigital number, since it uses as much as digits as its factorization.

18531072000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 436 (or 400 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 27.

Adding to 18531072000 its reverse (27013581), we get a palindrome (18558085581).

The spelling of 18531072000 in words is "eighteen billion, five hundred thirty-one million, seventy-two thousand".