28756477823 has 4 divisors (see below), whose sum is σ = 30448035360. Its totient is φ = 27064920288.

The previous prime is 28756477817. The next prime is 28756477847. The reversal of 28756477823 is 32877465782.

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 28756477823 - 2⁶ = 28756477759 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28756477853) 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, 845778743 + ... + 845778776.

It is an arithmetic number, because the mean of its divisors is an integer number (7612008840).

Almost surely, 2^28756477823 is an apocalyptic number.

28756477823 is a deficient number, since it is larger than the sum of its proper divisors (1691557537).

28756477823 is a wasteful number, since it uses less digits than its factorization.

28756477823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1691557536.

The product of its digits is 31610880, while the sum is 59.

The spelling of 28756477823 in words is "twenty-eight billion, seven hundred fifty-six million, four hundred seventy-seven thousand, eight hundred twenty-three".