18025644 has 96 divisors (see below), whose sum is σ = 54867456. Its totient is φ = 4469760.

The previous prime is 18025639. The next prime is 18025649. The reversal of 18025644 is 44652081.

It is an interprime number because it is at equal distance from previous prime (18025639) and next prime (18025649).

It is a super-2 number, since 2×18025644² = 649847683229472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18025649) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18079 + ... + 19049.

It is an arithmetic number, because the mean of its divisors is an integer number (571536).

Almost surely, 2^18025644 is an apocalyptic number.

18025644 is a gapful number since it is divisible by the number (14) 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 18025644, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27433728).

18025644 is an abundant number, since it is smaller than the sum of its proper divisors (36841812).

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

18025644 is a wasteful number, since it uses less digits than its factorization.

18025644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1015 (or 1013 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 30.

The square root of 18025644 is about 4245.6617858704. The cubic root of 18025644 is about 262.1985364617.

It can be divided in two parts, 180256 and 44, that added together give a triangular number (180300 = T₆₀₀).

The spelling of 18025644 in words is "eighteen million, twenty-five thousand, six hundred forty-four".