18230987520 has 216 divisors, whose sum is σ = 65414630736. Its totient is φ = 4861513728.

The previous prime is 18230987507. The next prime is 18230987569. The reversal of 18230987520 is 2578903281.

It is a happy number.

18230987520 is a `hidden beast` number, since 1 + 8 + 2 + 30 + 98 + 7 + 520 = 666.

It is a tau number, because it is divible by the number of its divisors (216).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 281734 + ... + 340346.

Almost surely, 2^18230987520 is an apocalyptic number.

18230987520 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 18230987520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32707315368).

18230987520 is an abundant number, since it is smaller than the sum of its proper divisors (47183643216).

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

18230987520 is an frugal number, since it uses more digits than its factorization.

18230987520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58649 (or 58623 counting only the distinct ones).

The product of its (nonzero) digits is 241920, while the sum is 45.

The spelling of 18230987520 in words is "eighteen billion, two hundred thirty million, nine hundred eighty-seven thousand, five hundred twenty".