26979681 has 16 divisors (see below), whose sum is σ = 37009728. Its totient is φ = 17472000.

The previous prime is 26979671. The next prime is 26979683. The reversal of 26979681 is 18697962.

It is not a de Polignac number, because 26979681 - 2¹⁹ = 26455393 is a prime.

It is a super-2 number, since 2×26979681² = 1455806373723522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 26979681.

It is not an unprimeable number, because it can be changed into a prime (26979683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49050 + ... + 49596.

It is an arithmetic number, because the mean of its divisors is an integer number (2313108).

Almost surely, 2^26979681 is an apocalyptic number.

It is an amenable number.

26979681 is a deficient number, since it is larger than the sum of its proper divisors (10030047).

26979681 is a wasteful number, since it uses less digits than its factorization.

26979681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 992.

The product of its digits is 326592, while the sum is 48.

The square root of 26979681 is about 5194.1968580330. The cubic root of 26979681 is about 299.9247255586.

The spelling of 26979681 in words is "twenty-six million, nine hundred seventy-nine thousand, six hundred eighty-one".