26971690 has 16 divisors (see below), whose sum is σ = 51405192. Its totient is φ = 10153984.

The previous prime is 26971619. The next prime is 26971691. The reversal of 26971690 is 9617962.

It can be written as a sum of positive squares in 4 ways, for example, as 26615281 + 356409 = 5159^2 + 597^2 .

It is a super-2 number, since 2×26971690² = 1454944122912200, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (26971691) 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 7 ways as a sum of consecutive naturals, for example, 79159 + ... + 79498.

Almost surely, 2^26971690 is an apocalyptic number.

26971690 is a deficient number, since it is larger than the sum of its proper divisors (24433502).

26971690 is a wasteful number, since it uses less digits than its factorization.

26971690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 158681.

The product of its (nonzero) digits is 40824, while the sum is 40.

The square root of 26971690 is about 5193.4275772364. The cubic root of 26971690 is about 299.8951114804.

The spelling of 26971690 in words is "twenty-six million, nine hundred seventy-one thousand, six hundred ninety".