28909707 has 8 divisors (see below), whose sum is σ = 40813776. Its totient is φ = 18139392.

The previous prime is 28909703. The next prime is 28909711. The reversal of 28909707 is 70790982.

It is an interprime number because it is at equal distance from previous prime (28909703) and next prime (28909711).

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28909707 - 2² = 28909703 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28909703) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 283378 + ... + 283479.

It is an arithmetic number, because the mean of its divisors is an integer number (5101722).

Almost surely, 2^28909707 is an apocalyptic number.

28909707 is a deficient number, since it is larger than the sum of its proper divisors (11904069).

28909707 is a wasteful number, since it uses less digits than its factorization.

28909707 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 566877.

The product of its (nonzero) digits is 63504, while the sum is 42.

The square root of 28909707 is about 5376.7747767598. The cubic root of 28909707 is about 306.9124904870.

The spelling of 28909707 in words is "twenty-eight million, nine hundred nine thousand, seven hundred seven".