26864639847 has 32 divisors (see below), whose sum is σ = 41951916800. Its totient is φ = 16943756256.

The previous prime is 26864639821. The next prime is 26864639849. The reversal of 26864639847 is 74893646862.

26864639847 is a `hidden beast` number, since 2 + 6 + 86 + 463 + 98 + 4 + 7 = 666.

It is not a de Polignac number, because 26864639847 - 2¹⁴ = 26864623463 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 (26864639849) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 340308 + ... + 411750.

It is an arithmetic number, because the mean of its divisors is an integer number (1310997400).

Almost surely, 2^26864639847 is an apocalyptic number.

26864639847 is a gapful number since it is divisible by the number (27) formed by its first and last digit.

26864639847 is a deficient number, since it is larger than the sum of its proper divisors (15087276953).

26864639847 is a wasteful number, since it uses less digits than its factorization.

26864639847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 72204 (or 72198 counting only the distinct ones).

The product of its digits is 83607552, while the sum is 63.

The spelling of 26864639847 in words is "twenty-six billion, eight hundred sixty-four million, six hundred thirty-nine thousand, eight hundred forty-seven".