28259730 has 24 divisors (see below), whose sum is σ = 73475532. Its totient is φ = 7535904.

The previous prime is 28259719. The next prime is 28259753. The reversal of 28259730 is 3795282.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28164249 + 95481 = 5307^2 + 309^2 .

It is a super-2 number, since 2×28259730² = 1597224679345800, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 156909 + ... + 157088.

Almost surely, 2^28259730 is an apocalyptic number.

28259730 is an abundant number, since it is smaller than the sum of its proper divisors (45215802).

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

28259730 is a wasteful number, since it uses less digits than its factorization.

28259730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314010 (or 314007 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 28259730 is about 5315.9881489710. The cubic root of 28259730 is about 304.5949294322.

The spelling of 28259730 in words is "twenty-eight million, two hundred fifty-nine thousand, seven hundred thirty".