28854571639 has 4 divisors (see below), whose sum is σ = 30109118256. Its totient is φ = 27600025024.

The previous prime is 28854571621. The next prime is 28854571657. The reversal of 28854571639 is 93617545882.

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

It is an interprime number because it is at equal distance from previous prime (28854571621) and next prime (28854571657).

It is not a de Polignac number, because 28854571639 - 2²¹ = 28852474487 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 (28854571439) 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, 627273274 + ... + 627273319.

It is an arithmetic number, because the mean of its divisors is an integer number (7527279564).

Almost surely, 2^28854571639 is an apocalyptic number.

28854571639 is a deficient number, since it is larger than the sum of its proper divisors (1254546617).

28854571639 is a wasteful number, since it uses less digits than its factorization.

28854571639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1254546616.

The product of its digits is 14515200, while the sum is 58.

The spelling of 28854571639 in words is "twenty-eight billion, eight hundred fifty-four million, five hundred seventy-one thousand, six hundred thirty-nine".