18428624 has 20 divisors (see below), whose sum is σ = 35788260. Its totient is φ = 9192960.

The previous prime is 18428623. The next prime is 18428633. The reversal of 18428624 is 42682481.

It can be written as a sum of positive squares in 2 ways, for example, as 5953600 + 12475024 = 2440^2 + 3532^2 .

It is a super-2 number, since 2×18428624² = 679228365066752, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18428621) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7592 + ... + 9720.

It is an arithmetic number, because the mean of its divisors is an integer number (1789413).

Almost surely, 2^18428624 is an apocalyptic number.

It is an amenable number.

18428624 is a deficient number, since it is larger than the sum of its proper divisors (17359636).

18428624 is a wasteful number, since it uses less digits than its factorization.

18428624 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2678 (or 2672 counting only the distinct ones).

The product of its digits is 24576, while the sum is 35.

The square root of 18428624 is about 4292.8573235084. The cubic root of 18428624 is about 264.1380514581.

The spelling of 18428624 in words is "eighteen million, four hundred twenty-eight thousand, six hundred twenty-four".