28918705 has 8 divisors (see below), whose sum is σ = 36211392. Its totient is φ = 22129008.

The previous prime is 28918699. The next prime is 28918711. The reversal of 28918705 is 50781982.

It is an interprime number because it is at equal distance from previous prime (28918699) and next prime (28918711).

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

It is a cyclic number.

It is not a de Polignac number, because 28918705 - 2⁹ = 28918193 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 125619 + ... + 125848.

It is an arithmetic number, because the mean of its divisors is an integer number (4526424).

Almost surely, 2^28918705 is an apocalyptic number.

It is an amenable number.

28918705 is a deficient number, since it is larger than the sum of its proper divisors (7292687).

28918705 is a wasteful number, since it uses less digits than its factorization.

28918705 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 251495.

The product of its (nonzero) digits is 40320, while the sum is 40.

The square root of 28918705 is about 5377.6114586311. The cubic root of 28918705 is about 306.9443288372.

The spelling of 28918705 in words is "twenty-eight million, nine hundred eighteen thousand, seven hundred five".