26491540140 has 288 divisors, whose sum is σ = 88654378176. Its totient is φ = 6363002880.

The previous prime is 26491540099. The next prime is 26491540183. The reversal of 26491540140 is 4104519462.

26491540140 is a `hidden beast` number, since 2 + 649 + 1 + 5 + 4 + 0 + 1 + 4 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 26491540095 and 26491540104.

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, 28152070 + ... + 28153010.

It is an arithmetic number, because the mean of its divisors is an integer number (307827702).

Almost surely, 2^26491540140 is an apocalyptic number.

26491540140 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 26491540140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44327189088).

26491540140 is an abundant number, since it is smaller than the sum of its proper divisors (62162838036).

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

26491540140 is a wasteful number, since it uses less digits than its factorization.

26491540140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1249 (or 1244 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 36.

The spelling of 26491540140 in words is "twenty-six billion, four hundred ninety-one million, five hundred forty thousand, one hundred forty".