26563640 has 16 divisors (see below), whose sum is σ = 59768280. Its totient is φ = 10625440.

The previous prime is 26563633. The next prime is 26563651. The reversal of 26563640 is 4636562.

It is a junction number, because it is equal to n+sod(n) for n = 26563597 and 26563606.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 332006 + ... + 332085.

Almost surely, 2^26563640 is an apocalyptic number.

26563640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26563640 is an abundant number, since it is smaller than the sum of its proper divisors (33204640).

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

26563640 is a wasteful number, since it uses less digits than its factorization.

26563640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 664102 (or 664098 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 32.

The square root of 26563640 is about 5153.9926270805. The cubic root of 26563640 is about 298.3750663783.

The spelling of 26563640 in words is "twenty-six million, five hundred sixty-three thousand, six hundred forty".