28889307 has 36 divisors (see below), whose sum is σ = 45976320. Its totient is φ = 17455872.

The previous prime is 28889281. The next prime is 28889309. The reversal of 28889307 is 70398882.

It is not a de Polignac number, because 28889307 - 2¹⁰ = 28888283 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28889309) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 75238 + ... + 75620.

It is an arithmetic number, because the mean of its divisors is an integer number (1277120).

Almost surely, 2^28889307 is an apocalyptic number.

28889307 is a deficient number, since it is larger than the sum of its proper divisors (17087013).

28889307 is a wasteful number, since it uses less digits than its factorization.

28889307 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 452 (or 432 counting only the distinct ones).

The product of its (nonzero) digits is 193536, while the sum is 45.

The square root of 28889307 is about 5374.8773939505. The cubic root of 28889307 is about 306.8402830439.

The spelling of 28889307 in words is "twenty-eight million, eight hundred eighty-nine thousand, three hundred seven".