26806640 has 40 divisors (see below), whose sum is σ = 71230560. Its totient is φ = 9190656.

The previous prime is 26806639. The next prime is 26806649. The reversal of 26806640 is 4660862.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a junction number, because it is equal to n+sod(n) for n = 26806597 and 26806606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26806649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23375 + ... + 24494.

It is an arithmetic number, because the mean of its divisors is an integer number (1780764).

Almost surely, 2^26806640 is an apocalyptic number.

26806640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26806640 is an abundant number, since it is smaller than the sum of its proper divisors (44423920).

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

26806640 is a wasteful number, since it uses less digits than its factorization.

26806640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 47889 (or 47883 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 32.

The square root of 26806640 is about 5177.5129164494. The cubic root of 26806640 is about 299.2821354570.

The spelling of 26806640 in words is "twenty-six million, eight hundred six thousand, six hundred forty".