26638660 has 48 divisors (see below), whose sum is σ = 60528384. Its totient is φ = 9809408.

The previous prime is 26638637. The next prime is 26638663. The reversal of 26638660 is 6683662.

It is not an unprimeable number, because it can be changed into a prime (26638663) 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, 15147 + ... + 16813.

It is an arithmetic number, because the mean of its divisors is an integer number (1261008).

Almost surely, 2^26638660 is an apocalyptic number.

26638660 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 26638660, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30264192).

26638660 is an abundant number, since it is smaller than the sum of its proper divisors (33889724).

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

26638660 is a wasteful number, since it uses less digits than its factorization.

26638660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1740 (or 1738 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 37.

The square root of 26638660 is about 5161.2653487299. The cubic root of 26638660 is about 298.6556887928.

The spelling of 26638660 in words is "twenty-six million, six hundred thirty-eight thousand, six hundred sixty".