26640540 has 108 divisors (see below), whose sum is σ = 83797896. Its totient is φ = 6849216.

The previous prime is 26640533. The next prime is 26640569. The reversal of 26640540 is 4504662.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 397587 + ... + 397653.

Almost surely, 2^26640540 is an apocalyptic number.

26640540 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 26640540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41898948).

26640540 is an abundant number, since it is smaller than the sum of its proper divisors (57157356).

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

26640540 is a wasteful number, since it uses less digits than its factorization.

26640540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 176 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 26640540 is about 5161.4474713979. The cubic root of 26640540 is about 298.6627144150.

The spelling of 26640540 in words is "twenty-six million, six hundred forty thousand, five hundred forty".