26878681 has 4 divisors (see below), whose sum is σ = 27027364. Its totient is φ = 26730000.

The previous prime is 26878627. The next prime is 26878693. The reversal of 26878681 is 18687862.

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

It can be written as a sum of positive squares in 2 ways, for example, as 2277081 + 24601600 = 1509^2 + 4960^2 .

It is a cyclic number.

It is not a de Polignac number, because 26878681 - 2¹⁵ = 26845913 is a prime.

It is a super-2 number, since 2×26878681² = 1444926984599522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26878601) 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, 74070 + ... + 74431.

It is an arithmetic number, because the mean of its divisors is an integer number (6756841).

Almost surely, 2^26878681 is an apocalyptic number.

It is an amenable number.

26878681 is a deficient number, since it is larger than the sum of its proper divisors (148683).

26878681 is a wasteful number, since it uses less digits than its factorization.

26878681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148682.

The product of its digits is 258048, while the sum is 46.

The square root of 26878681 is about 5184.4653533417. The cubic root of 26878681 is about 299.5499956950.

The spelling of 26878681 in words is "twenty-six million, eight hundred seventy-eight thousand, six hundred eighty-one".