18728630 has 16 divisors (see below), whose sum is σ = 33785424. Its totient is φ = 7475040.

The previous prime is 18728629. The next prime is 18728639. The reversal of 18728630 is 3682781.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18728639) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3440 + ... + 7020.

It is an arithmetic number, because the mean of its divisors is an integer number (2111589).

Almost surely, 2^18728630 is an apocalyptic number.

18728630 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18728630 is a deficient number, since it is larger than the sum of its proper divisors (15056794).

18728630 is a wasteful number, since it uses less digits than its factorization.

18728630 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4111.

The product of its (nonzero) digits is 16128, while the sum is 35.

The square root of 18728630 is about 4327.6587203706. The cubic root of 18728630 is about 265.5636749779.

The spelling of 18728630 in words is "eighteen million, seven hundred twenty-eight thousand, six hundred thirty".