18728928240 has 160 divisors (see below), whose sum is σ = 63396228096. Its totient is φ = 4536161280.

The previous prime is 18728928209. The next prime is 18728928241. The reversal of 18728928240 is 4282982781.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18728928241) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3622137 + ... + 3627303.

Almost surely, 2^18728928240 is an apocalyptic number.

18728928240 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 18728928240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31698114048).

18728928240 is an abundant number, since it is smaller than the sum of its proper divisors (44667299856).

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

18728928240 is a wasteful number, since it uses less digits than its factorization.

18728928240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6567 (or 6561 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 51.

The spelling of 18728928240 in words is "eighteen billion, seven hundred twenty-eight million, nine hundred twenty-eight thousand, two hundred forty".