26640564 has 48 divisors (see below), whose sum is σ = 67370688. Its totient is φ = 8160768.

The previous prime is 26640533. The next prime is 26640569. The reversal of 26640564 is 46504662.

It is a hoax number, since the sum of its digits (33) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26640569) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7254 + ... + 10290.

It is an arithmetic number, because the mean of its divisors is an integer number (1403556).

Almost surely, 2^26640564 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26640564, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33685344).

26640564 is an abundant number, since it is smaller than the sum of its proper divisors (40730124).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

26640564 is a wasteful number, since it uses less digits than its factorization.

26640564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3104 (or 3102 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The square root of 26640564 is about 5161.4497963266. The cubic root of 26640564 is about 298.6628041017.

The spelling of 26640564 in words is "twenty-six million, six hundred forty thousand, five hundred sixty-four".