18280736 has 48 divisors (see below), whose sum is σ = 38374560. Its totient is φ = 8547840.

The previous prime is 18280727. The next prime is 18280739. The reversal of 18280736 is 63708281.

It is a junction number, because it is equal to n+sod(n) for n = 18280696 and 18280705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18280739) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 64916 + ... + 65196.

It is an arithmetic number, because the mean of its divisors is an integer number (799470).

Almost surely, 2^18280736 is an apocalyptic number.

18280736 is a gapful number since it is divisible by the number (16) 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 18280736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19187280).

18280736 is an abundant number, since it is smaller than the sum of its proper divisors (20093824).

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

18280736 is a wasteful number, since it uses less digits than its factorization.

18280736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 417 (or 409 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 18280736 is about 4275.5977359897. The cubic root of 18280736 is about 263.4295918280.

The spelling of 18280736 in words is "eighteen million, two hundred eighty thousand, seven hundred thirty-six".