26981685 has 24 divisors (see below), whose sum is σ = 47300760. Its totient is φ = 14226432.

The previous prime is 26981681. The next prime is 26981693. The reversal of 26981685 is 58618962.

It can be written as a sum of positive squares in 4 ways, for example, as 695556 + 26286129 = 834^2 + 5127^2 .

It is not a de Polignac number, because 26981685 - 2² = 26981681 is a prime.

It is a super-2 number, since 2×26981685² = 1456022650878450, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 26981685.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26981681) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 637 + ... + 7373.

It is an arithmetic number, because the mean of its divisors is an integer number (1970865).

Almost surely, 2^26981685 is an apocalyptic number.

It is an amenable number.

26981685 is a deficient number, since it is larger than the sum of its proper divisors (20319075).

26981685 is a wasteful number, since it uses less digits than its factorization.

26981685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6837 (or 6834 counting only the distinct ones).

The product of its digits is 207360, while the sum is 45.

The square root of 26981685 is about 5194.3897620414. The cubic root of 26981685 is about 299.9321513230.

The spelling of 26981685 in words is "twenty-six million, nine hundred eighty-one thousand, six hundred eighty-five".