18571072 has 84 divisors (see below), whose sum is σ = 42670476. Its totient is φ = 7987200.

The previous prime is 18571067. The next prime is 18571099. The reversal of 18571072 is 27017581.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 46656 + 18524416 = 216^2 + 4304^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 183822 + ... + 183922.

Almost surely, 2^18571072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18571072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21335238).

18571072 is an abundant number, since it is smaller than the sum of its proper divisors (24099404).

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

18571072 is a wasteful number, since it uses less digits than its factorization.

18571072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 156 (or 133 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 18571072 is about 4309.4166658609. The cubic root of 18571072 is about 264.8168759762.

The spelling of 18571072 in words is "eighteen million, five hundred seventy-one thousand, seventy-two".