26961681 has 16 divisors (see below), whose sum is σ = 37647360. Its totient is φ = 17130960.

The previous prime is 26961659. The next prime is 26961709. The reversal of 26961681 is 18616962.

It is not a de Polignac number, because 26961681 - 2⁹ = 26961169 is a prime.

It is a super-2 number, since 2×26961681² = 1453864484691522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26961281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25636 + ... + 26666.

It is an arithmetic number, because the mean of its divisors is an integer number (2352960).

Almost surely, 2^26961681 is an apocalyptic number.

It is an amenable number.

26961681 is a deficient number, since it is larger than the sum of its proper divisors (10685679).

26961681 is a wasteful number, since it uses less digits than its factorization.

26961681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1436.

The product of its digits is 31104, while the sum is 39.

The square root of 26961681 is about 5192.4638660274. The cubic root of 26961681 is about 299.8580105851.

The spelling of 26961681 in words is "twenty-six million, nine hundred sixty-one thousand, six hundred eighty-one".