28580217823 has 4 divisors (see below), whose sum is σ = 28592597880. Its totient is φ = 28567837768.

The previous prime is 28580217737. The next prime is 28580217929. The reversal of 28580217823 is 32871208582.

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 28580217823 - 2²¹ = 28578120671 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 (28580212823) 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, 6186565 + ... + 6191182.

It is an arithmetic number, because the mean of its divisors is an integer number (7148149470).

Almost surely, 2^28580217823 is an apocalyptic number.

28580217823 is a deficient number, since it is larger than the sum of its proper divisors (12380057).

28580217823 is a wasteful number, since it uses less digits than its factorization.

28580217823 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12380056.

The product of its (nonzero) digits is 430080, while the sum is 46.

The spelling of 28580217823 in words is "twenty-eight billion, five hundred eighty million, two hundred seventeen thousand, eight hundred twenty-three".