28018730 has 64 divisors (see below), whose sum is σ = 56401920. Its totient is φ = 9979200.

The previous prime is 28018729. The next prime is 28018733. The reversal of 28018730 is 3781082.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 28018693 and 28018702.

It is not an unprimeable number, because it can be changed into a prime (28018733) 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 31 ways as a sum of consecutive naturals, for example, 394595 + ... + 394665.

It is an arithmetic number, because the mean of its divisors is an integer number (881280).

Almost surely, 2^28018730 is an apocalyptic number.

28018730 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

28018730 is a wasteful number, since it uses less digits than its factorization.

28018730 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195.

The product of its (nonzero) digits is 2688, while the sum is 29.

The square root of 28018730 is about 5293.2721449024. The cubic root of 28018730 is about 303.7265907998.

The spelling of 28018730 in words is "twenty-eight million, eighteen thousand, seven hundred thirty".