18077072 has 40 divisors (see below), whose sum is σ = 37981944. Its totient is φ = 8285184.

The previous prime is 18077051. The next prime is 18077077. The reversal of 18077072 is 27077081.

It can be written as a sum of positive squares in 4 ways, for example, as 65536 + 18011536 = 256^2 + 4244^2 .

It is not an unprimeable number, because it can be changed into a prime (18077077) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48278 + ... + 48650.

Almost surely, 2^18077072 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 18077072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18990972).

18077072 is an abundant number, since it is smaller than the sum of its proper divisors (19904872).

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

18077072 is a wasteful number, since it uses less digits than its factorization.

18077072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 627 (or 621 counting only the distinct ones).

The product of its (nonzero) digits is 5488, while the sum is 32.

The square root of 18077072 is about 4251.7140073152. The cubic root of 18077072 is about 262.4476545662.

Subtracting 18077072 from its reverse (27077081), we obtain a palindrome (9000009).

The spelling of 18077072 in words is "eighteen million, seventy-seven thousand, seventy-two".