1265772768 has 192 divisors, whose sum is σ = 3713149440. Its totient is φ = 375072768.

The previous prime is 1265772763. The next prime is 1265772803. The reversal of 1265772768 is 8672775621.

It is a self number, because there is not a number n which added to its sum of digits gives 1265772768.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265772763) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5527278 + ... + 5527506.

It is an arithmetic number, because the mean of its divisors is an integer number (19339320).

Almost surely, 2^1265772768 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 1265772768, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1856574720).

1265772768 is an abundant number, since it is smaller than the sum of its proper divisors (2447376672).

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

1265772768 is a wasteful number, since it uses less digits than its factorization.

1265772768 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 401 (or 393 counting only the distinct ones).

The product of its digits is 1975680, while the sum is 51.

The square root of 1265772768 is about 35577.7004315906. The cubic root of 1265772768 is about 1081.7292735411.

The spelling of 1265772768 in words is "one billion, two hundred sixty-five million, seven hundred seventy-two thousand, seven hundred sixty-eight".