28567723405 has 8 divisors (see below), whose sum is σ = 36918288792. Its totient is φ = 21096164928.

The previous prime is 28567723369. The next prime is 28567723411. The reversal of 28567723405 is 50432776582.

It can be written as a sum of positive squares in 4 ways, for example, as 1860973321 + 26706750084 = 43139^2 + 163422^2 .

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 28567723405 - 2¹⁵ = 28567690637 is a prime.

It is a super-2 number, since 2×28567723405² (a number of 22 digits) contains 22 as substring.

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 (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 219751654 + ... + 219751783.

It is an arithmetic number, because the mean of its divisors is an integer number (4614786099).

Almost surely, 2^28567723405 is an apocalyptic number.

It is an amenable number.

28567723405 is a deficient number, since it is larger than the sum of its proper divisors (8350565387).

28567723405 is a wasteful number, since it uses less digits than its factorization.

28567723405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 439503455.

The product of its (nonzero) digits is 2822400, while the sum is 49.

The spelling of 28567723405 in words is "twenty-eight billion, five hundred sixty-seven million, seven hundred twenty-three thousand, four hundred five".