28656259249 has 32 divisors (see below), whose sum is σ = 31092336000. Its totient is φ = 26330033664.

The previous prime is 28656259243. The next prime is 28656259267. The reversal of 28656259249 is 94295265682.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 28656259249 - 2²⁷ = 28522041521 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28656259193 and 28656259202.

It is not an unprimeable number, because it can be changed into a prime (28656259243) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 19721407 + ... + 19722859.

It is an arithmetic number, because the mean of its divisors is an integer number (971635500).

Almost surely, 2^28656259249 is an apocalyptic number.

It is an amenable number.

28656259249 is a deficient number, since it is larger than the sum of its proper divisors (2436076751).

28656259249 is a wasteful number, since it uses less digits than its factorization.

28656259249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1777.

The product of its digits is 18662400, while the sum is 58.

The spelling of 28656259249 in words is "twenty-eight billion, six hundred fifty-six million, two hundred fifty-nine thousand, two hundred forty-nine".