18784724880 has 80 divisors (see below), whose sum is σ = 58358764800. Its totient is φ = 4998411264.

The previous prime is 18784724869. The next prime is 18784724891. The reversal of 18784724880 is 8842748781.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (18784724869) and next prime (18784724891).

It is a tau number, because it is divible by the number of its divisors (80).

It is a self number, because there is not a number n which added to its sum of digits gives 18784724880.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26596 + ... + 195644.

It is an arithmetic number, because the mean of its divisors is an integer number (729484560).

Almost surely, 2^18784724880 is an apocalyptic number.

18784724880 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 18784724880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29179382400).

18784724880 is an abundant number, since it is smaller than the sum of its proper divisors (39574039920).

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

18784724880 is a wasteful number, since it uses less digits than its factorization.

18784724880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 169528 (or 169522 counting only the distinct ones).

The product of its (nonzero) digits is 6422528, while the sum is 57.

The spelling of 18784724880 in words is "eighteen billion, seven hundred eighty-four million, seven hundred twenty-four thousand, eight hundred eighty".