26091664 has 15 divisors (see below), whose sum is σ = 50592217. Its totient is φ = 13035616.

The previous prime is 26091661. The next prime is 26091671. The reversal of 26091664 is 46619062.

The square root of 26091664 is 5108.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 17139600 + 8952064 = 4140^2 + 2992^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (26091661) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 19794 + ... + 21070.

Almost surely, 2^26091664 is an apocalyptic number.

26091664 is the 5108-th square number.

It is an amenable number.

26091664 is a deficient number, since it is larger than the sum of its proper divisors (24500553).

26091664 is an frugal number, since it uses more digits than its factorization.

26091664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2562 (or 1279 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The cubic root of 26091664 is about 296.5973449667.

The spelling of 26091664 in words is "twenty-six million, ninety-one thousand, six hundred sixty-four".