28206584639 has 8 divisors (see below), whose sum is σ = 28902845328. Its totient is φ = 27510719040.

The previous prime is 28206584633. The next prime is 28206584641. The reversal of 28206584639 is 93648560282.

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 28206584639 - 2¹² = 28206580543 is a prime.

It is a super-2 number, since 2×28206584639² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28206584633) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 48449 + ... + 242405.

It is an arithmetic number, because the mean of its divisors is an integer number (3612855666).

Almost surely, 2^28206584639 is an apocalyptic number.

28206584639 is a deficient number, since it is larger than the sum of its proper divisors (696260689).

28206584639 is a wasteful number, since it uses less digits than its factorization.

28206584639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 197545.

The product of its (nonzero) digits is 4976640, while the sum is 53.

The spelling of 28206584639 in words is "twenty-eight billion, two hundred six million, five hundred eighty-four thousand, six hundred thirty-nine".