28697759 has 4 divisors (see below), whose sum is σ = 28863816. Its totient is φ = 28531704.

The previous prime is 28697743. The next prime is 28697761. The reversal of 28697759 is 95779682.

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

It is a cyclic number.

It is not a de Polignac number, because 28697759 - 2⁴ = 28697743 is a prime.

It is a super-2 number, since 2×28697759² = 1647122743244162, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28697759.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28697719) 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, 82769 + ... + 83114.

It is an arithmetic number, because the mean of its divisors is an integer number (7215954).

Almost surely, 2^28697759 is an apocalyptic number.

28697759 is a deficient number, since it is larger than the sum of its proper divisors (166057).

28697759 is a wasteful number, since it uses less digits than its factorization.

28697759 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 166056.

The product of its digits is 1905120, while the sum is 53.

The square root of 28697759 is about 5357.0289340268. The cubic root of 28697759 is about 306.1606195363.

The spelling of 28697759 in words is "twenty-eight million, six hundred ninety-seven thousand, seven hundred fifty-nine".