26662640 has 20 divisors (see below), whose sum is σ = 61990824. Its totient is φ = 10665024.

The previous prime is 26662639. The next prime is 26662651. The reversal of 26662640 is 4626662.

It is a tau number, because it is divible by the number of its divisors (20).

It is a junction number, because it is equal to n+sod(n) for n = 26662597 and 26662606.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 166562 + ... + 166721.

Almost surely, 2^26662640 is an apocalyptic number.

26662640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26662640 is an abundant number, since it is smaller than the sum of its proper divisors (35328184).

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

26662640 is a wasteful number, since it uses less digits than its factorization.

26662640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333296 (or 333290 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 26662640 is about 5163.5878999006. The cubic root of 26662640 is about 298.7452780776.

The spelling of 26662640 in words is "twenty-six million, six hundred sixty-two thousand, six hundred forty".