18743387520 has 512 divisors, whose sum is σ = 73904140800. Its totient is φ = 3972464640.

The previous prime is 18743387437. The next prime is 18743387563. The reversal of 18743387520 is 2578334781.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 18743387520.

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, 5214844 + ... + 5218436.

It is an arithmetic number, because the mean of its divisors is an integer number (144344025).

Almost surely, 2^18743387520 is an apocalyptic number.

18743387520 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 18743387520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36952070400).

18743387520 is an abundant number, since it is smaller than the sum of its proper divisors (55160753280).

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

18743387520 is a wasteful number, since it uses less digits than its factorization.

18743387520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3658 (or 3646 counting only the distinct ones).

The product of its (nonzero) digits is 1128960, while the sum is 48.

The spelling of 18743387520 in words is "eighteen billion, seven hundred forty-three million, three hundred eighty-seven thousand, five hundred twenty".