26146640 has 80 divisors (see below), whose sum is σ = 67662336. Its totient is φ = 9331200.

The previous prime is 26146639. The next prime is 26146657. The reversal of 26146640 is 4664162.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31835 + ... + 32645.

Almost surely, 2^26146640 is an apocalyptic number.

26146640 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 26146640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33831168).

26146640 is an abundant number, since it is smaller than the sum of its proper divisors (41515696).

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

26146640 is a wasteful number, since it uses less digits than its factorization.

26146640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 868 (or 862 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 29.

The square root of 26146640 is about 5113.3785308737. The cubic root of 26146640 is about 296.8055123055.

The spelling of 26146640 in words is "twenty-six million, one hundred forty-six thousand, six hundred forty".