26217640 has 32 divisors (see below), whose sum is σ = 59217480. Its totient is φ = 10446592.

The previous prime is 26217637. The next prime is 26217641. The reversal of 26217640 is 4671262.

It can be written as a sum of positive squares in 4 ways, for example, as 26193924 + 23716 = 5118^2 + 154^2 .

It is a junction number, because it is equal to n+sod(n) for n = 26217599 and 26217608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26217641) 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, 10602 + ... + 12838.

Almost surely, 2^26217640 is an apocalyptic number.

26217640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26217640 is an abundant number, since it is smaller than the sum of its proper divisors (32999840).

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

26217640 is a wasteful number, since it uses less digits than its factorization.

26217640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2541 (or 2537 counting only the distinct ones).

The product of its (nonzero) digits is 4032, while the sum is 28.

The square root of 26217640 is about 5120.3163964740. The cubic root of 26217640 is about 297.0739234113.

The spelling of 26217640 in words is "twenty-six million, two hundred seventeen thousand, six hundred forty".