26401664 has 16 divisors (see below), whose sum is σ = 52597320. Its totient is φ = 13200768.

The previous prime is 26401651. The next prime is 26401667. The reversal of 26401664 is 46610462.

It is a tau number, because it is divible by the number of its divisors (16).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26401667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103004 + ... + 103259.

Almost surely, 2^26401664 is an apocalyptic number.

It is an amenable number.

26401664 is a deficient number, since it is larger than the sum of its proper divisors (26195656).

26401664 is an equidigital number, since it uses as much as digits as its factorization.

26401664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206277 (or 206265 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 26401664 is about 5138.2549566949. The cubic root of 26401664 is about 297.7673664503.

The spelling of 26401664 in words is "twenty-six million, four hundred one thousand, six hundred sixty-four".