26658040 has 64 divisors (see below), whose sum is σ = 64152000. Its totient is φ = 9934848.

The previous prime is 26658031. The next prime is 26658053. The reversal of 26658040 is 4085662.

It is a junction number, because it is equal to n+sod(n) for n = 26657993 and 26658011.

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 133861 + ... + 134059.

It is an arithmetic number, because the mean of its divisors is an integer number (1002375).

Almost surely, 2^26658040 is an apocalyptic number.

26658040 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 26658040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32076000).

26658040 is an abundant number, since it is smaller than the sum of its proper divisors (37493960).

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

26658040 is a wasteful number, since it uses less digits than its factorization.

26658040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 424 (or 420 counting only the distinct ones).

The product of its (nonzero) digits is 11520, while the sum is 31.

The square root of 26658040 is about 5163.1424539712. The cubic root of 26658040 is about 298.7280966417.

The spelling of 26658040 in words is "twenty-six million, six hundred fifty-eight thousand, forty".