26450609640 has 256 divisors, whose sum is σ = 99658944000. Its totient is φ = 5580675072.

The previous prime is 26450609639. The next prime is 26450609683. The reversal of 26450609640 is 4690605462.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a junction number, because it is equal to n+sod(n) for n = 26450609592 and 26450609601.

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, 510364 + ... + 559796.

It is an arithmetic number, because the mean of its divisors is an integer number (389292750).

Almost surely, 2^26450609640 is an apocalyptic number.

26450609640 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 26450609640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49829472000).

26450609640 is an abundant number, since it is smaller than the sum of its proper divisors (73208334360).

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

26450609640 is a wasteful number, since it uses less digits than its factorization.

26450609640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49481 (or 49463 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The spelling of 26450609640 in words is "twenty-six billion, four hundred fifty million, six hundred nine thousand, six hundred forty".