26731640 has 32 divisors (see below), whose sum is σ = 64774080. Its totient is φ = 9869952.

The previous prime is 26731609. The next prime is 26731657. The reversal of 26731640 is 4613762.

It is a plaindrome in base 14.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 25184 + ... + 26223.

It is an arithmetic number, because the mean of its divisors is an integer number (2024190).

Almost surely, 2^26731640 is an apocalyptic number.

26731640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

26731640 is an abundant number, since it is smaller than the sum of its proper divisors (38042440).

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

26731640 is a wasteful number, since it uses less digits than its factorization.

26731640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51431 (or 51427 counting only the distinct ones).

The product of its (nonzero) digits is 6048, while the sum is 29.

The square root of 26731640 is about 5170.2649835381. The cubic root of 26731640 is about 299.0027628071.

The spelling of 26731640 in words is "twenty-six million, seven hundred thirty-one thousand, six hundred forty".