28056123547 has 4 divisors (see below), whose sum is σ = 28328513200. Its totient is φ = 27783733896.

The previous prime is 28056123517. The next prime is 28056123569. The reversal of 28056123547 is 74532165082.

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

It is a cyclic number.

It is not a de Polignac number, because 28056123547 - 2³¹ = 25908639899 is a prime.

It is a super-2 number, since 2×28056123547² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28056123517) 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, 136194672 + ... + 136194877.

It is an arithmetic number, because the mean of its divisors is an integer number (7082128300).

Almost surely, 2^28056123547 is an apocalyptic number.

28056123547 is a deficient number, since it is larger than the sum of its proper divisors (272389653).

28056123547 is a wasteful number, since it uses less digits than its factorization.

28056123547 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 272389652.

The product of its (nonzero) digits is 403200, while the sum is 43.

The spelling of 28056123547 in words is "twenty-eight billion, fifty-six million, one hundred twenty-three thousand, five hundred forty-seven".