18080736 has 48 divisors (see below), whose sum is σ = 47867904. Its totient is φ = 5975424.

The previous prime is 18080731. The next prime is 18080743. The reversal of 18080736 is 63708081.

It is a tau number, because it is divible by the number of its divisors (48).

It is a junction number, because it is equal to n+sod(n) for n = 18080697 and 18080706.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18080731) 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, 11451 + ... + 12933.

It is an arithmetic number, because the mean of its divisors is an integer number (997248).

Almost surely, 2^18080736 is an apocalyptic number.

18080736 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 18080736, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (23933952).

18080736 is an abundant number, since it is smaller than the sum of its proper divisors (29787168).

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

18080736 is a wasteful number, since it uses less digits than its factorization.

18080736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1623 (or 1615 counting only the distinct ones).

The product of its (nonzero) digits is 8064, while the sum is 33.

The square root of 18080736 is about 4252.1448705330. The cubic root of 18080736 is about 262.4653850048.

The spelling of 18080736 in words is "eighteen million, eighty thousand, seven hundred thirty-six".