28768907 has 4 divisors (see below), whose sum is σ = 30283080. Its totient is φ = 27254736.

The previous prime is 28768903. The next prime is 28768919. The reversal of 28768907 is 70986782.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28768907 - 2² = 28768903 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28768903) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 757058 + ... + 757095.

It is an arithmetic number, because the mean of its divisors is an integer number (7570770).

Almost surely, 2^28768907 is an apocalyptic number.

28768907 is a deficient number, since it is larger than the sum of its proper divisors (1514173).

28768907 is a wasteful number, since it uses less digits than its factorization.

28768907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1514172.

The product of its (nonzero) digits is 338688, while the sum is 47.

The square root of 28768907 is about 5363.6654444512. The cubic root of 28768907 is about 306.4134237030.

The spelling of 28768907 in words is "twenty-eight million, seven hundred sixty-eight thousand, nine hundred seven".