28365730 has 16 divisors (see below), whose sum is σ = 51428160. Its totient is φ = 11264112.

The previous prime is 28365721. The next prime is 28365731. The reversal of 28365730 is 3756382.

It is a super-2 number, since 2×28365730² = 1609229276865800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28365731) 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, 8814 + ... + 11593.

It is an arithmetic number, because the mean of its divisors is an integer number (3214260).

Almost surely, 2^28365730 is an apocalyptic number.

28365730 is a deficient number, since it is larger than the sum of its proper divisors (23062430).

28365730 is a wasteful number, since it uses less digits than its factorization.

28365730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20553.

The product of its (nonzero) digits is 30240, while the sum is 34.

The square root of 28365730 is about 5325.9487417736. The cubic root of 28365730 is about 304.9752913783.

The spelling of 28365730 in words is "twenty-eight million, three hundred sixty-five thousand, seven hundred thirty".