26666640 has 480 divisors, whose sum is σ = 123492096. Its totient is φ = 4976640.

The previous prime is 26666621. The next prime is 26666663. The reversal of 26666640 is 4666662.

It is a super-2 number, since 2×26666640² = 1422219377779200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 26666595 and 26666604.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 720702 + ... + 720738.

Almost surely, 2^26666640 is an apocalyptic number.

26666640 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 26666640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (61746048).

26666640 is an abundant number, since it is smaller than the sum of its proper divisors (96825456).

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

26666640 is a wasteful number, since it uses less digits than its factorization.

26666640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 87 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 36.

The square root of 26666640 is about 5163.9752129537. The cubic root of 26666640 is about 298.7602168503.

It can be divided in two parts, 26 and 666640, that added together give a palindrome (666666).

The spelling of 26666640 in words is "twenty-six million, six hundred sixty-six thousand, six hundred forty".