28730275 has 12 divisors (see below), whose sum is σ = 40715152. Its totient is φ = 19700640.

The previous prime is 28730267. The next prime is 28730281. The reversal of 28730275 is 57203782.

28730275 = 361² + 362² + ... + 510².

It is not a de Polignac number, because 28730275 - 2³ = 28730267 is a prime.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28730275.

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, 81912 + ... + 82261.

Almost surely, 2^28730275 is an apocalyptic number.

28730275 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28730275 is a deficient number, since it is larger than the sum of its proper divisors (11984877).

28730275 is a wasteful number, since it uses less digits than its factorization.

28730275 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 164190 (or 164185 counting only the distinct ones).

The product of its (nonzero) digits is 23520, while the sum is 34.

The square root of 28730275 is about 5360.0629660481. The cubic root of 28730275 is about 306.2762076697.

The spelling of 28730275 in words is "twenty-eight million, seven hundred thirty thousand, two hundred seventy-five".