26897698727640 has 384 divisors, whose sum is σ = 94638262118400. Its totient is φ = 6586143851520.

The previous prime is 26897698727623. The next prime is 26897698727651. The reversal of 26897698727640 is 4672789679862.

26897698727640 is a `hidden beast` number, since 268 + 9 + 7 + 6 + 9 + 87 + 276 + 4 + 0 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 26897698727640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 820560771 + ... + 820593549.

It is an arithmetic number, because the mean of its divisors is an integer number (246453807600).

Almost surely, 2^{26897698727640} is an apocalyptic number.

26897698727640 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 26897698727640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (47319131059200).

26897698727640 is an abundant number, since it is smaller than the sum of its proper divisors (67740563390760).

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

26897698727640 is a wasteful number, since it uses less digits than its factorization.

26897698727640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33727 (or 33720 counting only the distinct ones).

The product of its (nonzero) digits is 6145155072, while the sum is 81.

The spelling of 26897698727640 in words is "twenty-six trillion, eight hundred ninety-seven billion, six hundred ninety-eight million, seven hundred twenty-seven thousand, six hundred forty".