28308907 has 16 divisors (see below), whose sum is σ = 31843584. Its totient is φ = 24948000.

The previous prime is 28308887. The next prime is 28308911. The reversal of 28308907 is 70980382.

It is not a de Polignac number, because 28308907 - 2⁷ = 28308779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28308937) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 52057 + ... + 52597.

It is an arithmetic number, because the mean of its divisors is an integer number (1990224).

Almost surely, 2^28308907 is an apocalyptic number.

28308907 is a deficient number, since it is larger than the sum of its proper divisors (3534677).

28308907 is a wasteful number, since it uses less digits than its factorization.

28308907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 690.

The product of its (nonzero) digits is 24192, while the sum is 37.

The square root of 28308907 is about 5320.6115250035. The cubic root of 28308907 is about 304.7715103181.

The spelling of 28308907 in words is "twenty-eight million, three hundred eight thousand, nine hundred seven".