2605745688 has 64 divisors (see below), whose sum is σ = 8017685760. Its totient is φ = 687229056.

The previous prime is 2605745687. The next prime is 2605745711. The reversal of 2605745688 is 8865475062.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 2605745688.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2605745687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 594370 + ... + 598737.

It is an arithmetic number, because the mean of its divisors is an integer number (125276340).

Almost surely, 2^2605745688 is an apocalyptic number.

2605745688 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

2605745688 is an abundant number, since it is smaller than the sum of its proper divisors (5411940072).

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

2605745688 is a wasteful number, since it uses less digits than its factorization.

2605745688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1193136 (or 1193132 counting only the distinct ones).

The product of its (nonzero) digits is 3225600, while the sum is 51.

The square root of 2605745688 is about 51046.5051497162. The cubic root of 2605745688 is about 1376.0810342465.

The spelling of 2605745688 in words is "two billion, six hundred five million, seven hundred forty-five thousand, six hundred eighty-eight".