26166640 has 40 divisors (see below), whose sum is σ = 63487008. Its totient is φ = 10010880.

The previous prime is 26166601. The next prime is 26166641. The reversal of 26166640 is 4666162.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (26166641) 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, 5271 + ... + 8950.

Almost surely, 2^26166640 is an apocalyptic number.

26166640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26166640 is an abundant number, since it is smaller than the sum of its proper divisors (37320368).

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

26166640 is a wasteful number, since it uses less digits than its factorization.

26166640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14257 (or 14251 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 31.

The square root of 26166640 is about 5115.3338111994. Note that the first 3 decimals coincide. The cubic root of 26166640 is about 296.8811701765.

The spelling of 26166640 in words is "twenty-six million, one hundred sixty-six thousand, six hundred forty".