2605249864 has 96 divisors (see below), whose sum is σ = 6005301120. Its totient is φ = 1034270208.

The previous prime is 2605249861. The next prime is 2605249897. The reversal of 2605249864 is 4689425062.

It is not an unprimeable number, because it can be changed into a prime (2605249861) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 15983047 + ... + 15983209.

It is an arithmetic number, because the mean of its divisors is an integer number (62555220).

Almost surely, 2^2605249864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2605249864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3002650560).

2605249864 is an abundant number, since it is smaller than the sum of its proper divisors (3400051256).

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

2605249864 is a wasteful number, since it uses less digits than its factorization.

2605249864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 459 (or 292 counting only the distinct ones).

The product of its (nonzero) digits is 829440, while the sum is 46.

The square root of 2605249864 is about 51041.6483276158. The cubic root of 2605249864 is about 1375.9937479998.

The spelling of 2605249864 in words is "two billion, six hundred five million, two hundred forty-nine thousand, eight hundred sixty-four".