18052640 has 48 divisors (see below), whose sum is σ = 45164952. Its totient is φ = 6795264.

The previous prime is 18052637. The next prime is 18052651. The reversal of 18052640 is 4625081.

It can be written as a sum of positive squares in 4 ways, for example, as 11478544 + 6574096 = 3388^2 + 2564^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 599 + ... + 6038.

Almost surely, 2^18052640 is an apocalyptic number.

18052640 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 18052640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (22582476).

18052640 is an abundant number, since it is smaller than the sum of its proper divisors (27112312).

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

18052640 is a wasteful number, since it uses less digits than its factorization.

18052640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6669 (or 6661 counting only the distinct ones).

The product of its (nonzero) digits is 1920, while the sum is 26.

The square root of 18052640 is about 4248.8398416509. The cubic root of 18052640 is about 262.3293645388.

The spelling of 18052640 in words is "eighteen million, fifty-two thousand, six hundred forty".