28670907 has 4 divisors (see below), whose sum is σ = 38227880. Its totient is φ = 19113936.

The previous prime is 28670899. The next prime is 28670909. The reversal of 28670907 is 70907682.

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

It is not a de Polignac number, because 28670907 - 2³ = 28670899 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28670909) 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, 4778482 + ... + 4778487.

It is an arithmetic number, because the mean of its divisors is an integer number (9556970).

Almost surely, 2^28670907 is an apocalyptic number.

28670907 is a deficient number, since it is larger than the sum of its proper divisors (9556973).

28670907 is an equidigital number, since it uses as much as digits as its factorization.

28670907 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9556972.

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 28670907 is about 5354.5221075274. The cubic root of 28670907 is about 306.0650999944.

The spelling of 28670907 in words is "twenty-eight million, six hundred seventy thousand, nine hundred seven".