28914691 has 8 divisors (see below), whose sum is σ = 31188080. Its totient is φ = 26648352.

The previous prime is 28914689. The next prime is 28914707. The reversal of 28914691 is 19641982.

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 28914691 - 2¹ = 28914689 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28914631) 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, 9436 + ... + 12118.

It is an arithmetic number, because the mean of its divisors is an integer number (3898510).

Almost surely, 2^28914691 is an apocalyptic number.

28914691 is a deficient number, since it is larger than the sum of its proper divisors (2273389).

28914691 is a wasteful number, since it uses less digits than its factorization.

28914691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3525.

The product of its digits is 31104, while the sum is 40.

The square root of 28914691 is about 5377.2382316576. The cubic root of 28914691 is about 306.9301265929.

The spelling of 28914691 in words is "twenty-eight million, nine hundred fourteen thousand, six hundred ninety-one".