26057640 has 128 divisors (see below), whose sum is σ = 90869760. Its totient is φ = 5854464.

The previous prime is 26057621. The next prime is 26057641. The reversal of 26057640 is 4675062.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 26057598 and 26057607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26057641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 56049 + ... + 56511.

It is an arithmetic number, because the mean of its divisors is an integer number (709920).

Almost surely, 2^26057640 is an apocalyptic number.

26057640 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 26057640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (45434880).

26057640 is an abundant number, since it is smaller than the sum of its proper divisors (64812120).

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

26057640 is a wasteful number, since it uses less digits than its factorization.

26057640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 551 (or 547 counting only the distinct ones).

The product of its (nonzero) digits is 10080, while the sum is 30.

The square root of 26057640 is about 5104.6684515255. The cubic root of 26057640 is about 296.4683661261.

The spelling of 26057640 in words is "twenty-six million, fifty-seven thousand, six hundred forty".