28563289 has 8 divisors (see below), whose sum is σ = 31104000. Its totient is φ = 26126352.

The previous prime is 28563287. The next prime is 28563313. The reversal of 28563289 is 98236582.

28563289 = T₁₃₈₉ + T₁₃₉₀ + ... + T₁₄₁₇.

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 28563289 - 2¹ = 28563287 is a prime.

It is a super-2 number, since 2×28563289² = 1631722956995042, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28563287) 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, 25369 + ... + 26470.

It is an arithmetic number, because the mean of its divisors is an integer number (3888000).

Almost surely, 2^28563289 is an apocalyptic number.

28563289 is a gapful number since it is divisible by the number (29) formed by its first and last digit.

It is an amenable number.

28563289 is a deficient number, since it is larger than the sum of its proper divisors (2540711).

28563289 is a wasteful number, since it uses less digits than its factorization.

28563289 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51887.

The product of its digits is 207360, while the sum is 43.

The square root of 28563289 is about 5344.4633968248. The cubic root of 28563289 is about 305.6816751772.

The spelling of 28563289 in words is "twenty-eight million, five hundred sixty-three thousand, two hundred eighty-nine".