26671640 has 64 divisors (see below), whose sum is σ = 64683360. Its totient is φ = 9861120.

The previous prime is 26671639. The next prime is 26671661. The reversal of 26671640 is 4617662.

It is a super-2 number, since 2×26671640² = 1422752760579200, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 26671597 and 26671606.

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, 41159 + ... + 41801.

Almost surely, 2^26671640 is an apocalyptic number.

26671640 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 26671640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32341680).

26671640 is an abundant number, since it is smaller than the sum of its proper divisors (38011720).

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

26671640 is a wasteful number, since it uses less digits than its factorization.

26671640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 732 (or 728 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 32.

The square root of 26671640 is about 5164.4593134228. The cubic root of 26671640 is about 298.7788882157.

The spelling of 26671640 in words is "twenty-six million, six hundred seventy-one thousand, six hundred forty".