28657889 has 4 divisors (see below), whose sum is σ = 30862356. Its totient is φ = 26453424.

The previous prime is 28657879. The next prime is 28657897. The reversal of 28657889 is 98875682.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1960000 + 26697889 = 1400^2 + 5167^2 .

It is a cyclic number.

It is not a de Polignac number, because 28657889 - 2⁴ = 28657873 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28657889.

It is not an unprimeable number, because it can be changed into a prime (28657879) 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, 1102214 + ... + 1102239.

It is an arithmetic number, because the mean of its divisors is an integer number (7715589).

Almost surely, 2^28657889 is an apocalyptic number.

It is an amenable number.

28657889 is a deficient number, since it is larger than the sum of its proper divisors (2204467).

28657889 is a wasteful number, since it uses less digits than its factorization.

28657889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2204466.

The product of its digits is 1935360, while the sum is 53.

The square root of 28657889 is about 5353.3063614929. The cubic root of 28657889 is about 306.0187701189.

The spelling of 28657889 in words is "twenty-eight million, six hundred fifty-seven thousand, eight hundred eighty-nine".