26891864 has 8 divisors (see below), whose sum is σ = 50422260. Its totient is φ = 13445928.

The previous prime is 26891861. The next prime is 26891927. The reversal of 26891864 is 46819862.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26891861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1680734 + ... + 1680749.

Almost surely, 2^26891864 is an apocalyptic number.

It is an amenable number.

26891864 is a deficient number, since it is larger than the sum of its proper divisors (23530396).

26891864 is a wasteful number, since it uses less digits than its factorization.

26891864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3361489 (or 3361485 counting only the distinct ones).

The product of its digits is 165888, while the sum is 44.

The square root of 26891864 is about 5185.7365918450. The cubic root of 26891864 is about 299.5989604261.

The spelling of 26891864 in words is "twenty-six million, eight hundred ninety-one thousand, eight hundred sixty-four".