26842640 has 120 divisors (see below), whose sum is σ = 71245440. Its totient is φ = 9391360.

The previous prime is 26842619. The next prime is 26842663. The reversal of 26842640 is 4624862.

It is a happy number.

It is a junction number, because it is equal to n+sod(n) for n = 26842597 and 26842606.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 454931 + ... + 454989.

It is an arithmetic number, because the mean of its divisors is an integer number (593712).

Almost surely, 2^26842640 is an apocalyptic number.

26842640 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 26842640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35622720).

26842640 is an abundant number, since it is smaller than the sum of its proper divisors (44402800).

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

26842640 is a wasteful number, since it uses less digits than its factorization.

26842640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 141 (or 124 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 32.

The square root of 26842640 is about 5180.9883227045. The cubic root of 26842640 is about 299.4160492611.

The spelling of 26842640 in words is "twenty-six million, eight hundred forty-two thousand, six hundred forty".