28617978245 has 8 divisors (see below), whose sum is σ = 36361666584. Its totient is φ = 21547654144.

The previous prime is 28617978223. The next prime is 28617978251. The reversal of 28617978245 is 54287971682.

It can be written as a sum of positive squares in 4 ways, for example, as 8162399716 + 20455578529 = 90346^2 + 143023^2 .

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 28617978245 - 2⁸ = 28617977989 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 168340964 + ... + 168341133.

It is an arithmetic number, because the mean of its divisors is an integer number (4545208323).

Almost surely, 2^28617978245 is an apocalyptic number.

It is an amenable number.

28617978245 is a deficient number, since it is larger than the sum of its proper divisors (7743688339).

28617978245 is a wasteful number, since it uses less digits than its factorization.

28617978245 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 336682119.

The product of its digits is 13547520, while the sum is 59.

The spelling of 28617978245 in words is "twenty-eight billion, six hundred seventeen million, nine hundred seventy-eight thousand, two hundred forty-five".