28664751 has 8 divisors (see below), whose sum is σ = 39252784. Its totient is φ = 18593280.

The previous prime is 28664729. The next prime is 28664767. The reversal of 28664751 is 15746682.

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

It is not a de Polignac number, because 28664751 - 2⁶ = 28664687 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28664351) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 129010 + ... + 129231.

It is an arithmetic number, because the mean of its divisors is an integer number (4906598).

Almost surely, 2^28664751 is an apocalyptic number.

28664751 is a deficient number, since it is larger than the sum of its proper divisors (10588033).

28664751 is a wasteful number, since it uses less digits than its factorization.

28664751 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 258281.

The product of its digits is 80640, while the sum is 39.

The square root of 28664751 is about 5353.9472354516. The cubic root of 28664751 is about 306.0431930997.

The spelling of 28664751 in words is "twenty-eight million, six hundred sixty-four thousand, seven hundred fifty-one".