26642440 has 64 divisors (see below), whose sum is σ = 65992320. Its totient is φ = 9600000.

The previous prime is 26642431. The next prime is 26642449. The reversal of 26642440 is 4424662.

It is an interprime number because it is at equal distance from previous prime (26642431) and next prime (26642449).

It is a junction number, because it is equal to n+sod(n) for n = 26642399 and 26642408.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26642449) 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, 66240 + ... + 66640.

It is an arithmetic number, because the mean of its divisors is an integer number (1031130).

Almost surely, 2^26642440 is an apocalyptic number.

26642440 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 26642440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32996160).

26642440 is an abundant number, since it is smaller than the sum of its proper divisors (39349880).

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

26642440 is a wasteful number, since it uses less digits than its factorization.

26642440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 574 (or 570 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 28.

The square root of 26642440 is about 5161.6315250122. The cubic root of 26642440 is about 298.6698144421.

The spelling of 26642440 in words is "twenty-six million, six hundred forty-two thousand, four hundred forty".