26887144729 has 3 divisors (see below), whose sum is σ = 26887308703. Its totient is φ = 26886980756.

The previous prime is 26887144721. The next prime is 26887144799. The reversal of 26887144729 is 92744178862.

The square root of 26887144729 is 163973.

It is a perfect power (a square), and thus also a powerful number.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 92744178862 = 2 ⋅46372089431.

It can be written as a sum of positive squares in only one way, i.e., 4162185225 + 22724959504 = 64515^2 + 150748^2 .

It is not a de Polignac number, because 26887144729 - 2³ = 26887144721 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26887144721) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 81987 + ... + 245959.

Almost surely, 2^26887144729 is an apocalyptic number.

26887144729 is the 163973-rd square number.

26887144729 is the 81987-th centered octagonal number.

It is an amenable number.

26887144729 is a deficient number, since it is larger than the sum of its proper divisors (163974).

26887144729 is an frugal number, since it uses more digits than its factorization.

26887144729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 327946 (or 163973 counting only the distinct ones).

The product of its digits is 10838016, while the sum is 58.

It can be divided in two parts, 268871 and 44729, that added together give a square (313600 = 560²).

The spelling of 26887144729 in words is "twenty-six billion, eight hundred eighty-seven million, one hundred forty-four thousand, seven hundred twenty-nine".