18558072 has 80 divisors (see below), whose sum is σ = 56003640. Its totient is φ = 5707584.

The previous prime is 18558061. The next prime is 18558077. The reversal of 18558072 is 27085581.

18558072 is a `hidden beast` number, since 1 + 8 + 5 + 580 + 72 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18558077) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7323 + ... + 9525.

Almost surely, 2^18558072 is an apocalyptic number.

18558072 is a gapful number since it is divisible by the number (12) 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 18558072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28001820).

18558072 is an abundant number, since it is smaller than the sum of its proper divisors (37445568).

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

18558072 is a wasteful number, since it uses less digits than its factorization.

18558072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2234 (or 2221 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 18558072 is about 4307.9080770137. The cubic root of 18558072 is about 264.7550697614.

The spelling of 18558072 in words is "eighteen million, five hundred fifty-eight thousand, seventy-two".