26692643640 has 256 divisors, whose sum is σ = 87538913280. Its totient is φ = 6472120320.

The previous prime is 26692643599. The next prime is 26692643671. The reversal of 26692643640 is 4634629662.

It is a self number, because there is not a number n which added to its sum of digits gives 26692643640.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 43543974 + ... + 43544586.

It is an arithmetic number, because the mean of its divisors is an integer number (341948880).

Almost surely, 2^26692643640 is an apocalyptic number.

26692643640 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 26692643640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (43769456640).

26692643640 is an abundant number, since it is smaller than the sum of its proper divisors (60846269640).

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

26692643640 is a wasteful number, since it uses less digits than its factorization.

26692643640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1014 (or 1010 counting only the distinct ones).

The product of its (nonzero) digits is 2239488, while the sum is 48.

The spelling of 26692643640 in words is "twenty-six billion, six hundred ninety-two million, six hundred forty-three thousand, six hundred forty".