1265931264 has 88 divisors (see below), whose sum is σ = 3633834400. Its totient is φ = 389505024.

The previous prime is 1265931253. The next prime is 1265931269. The reversal of 1265931264 is 4621395621.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1265931269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24087 + ... + 55785.

Almost surely, 2^1265931264 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 1265931264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1816917200).

1265931264 is an abundant number, since it is smaller than the sum of its proper divisors (2367903136).

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

1265931264 is a wasteful number, since it uses less digits than its factorization.

1265931264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31735 (or 31717 counting only the distinct ones).

The product of its digits is 77760, while the sum is 39.

The square root of 1265931264 is about 35579.9278245474. The cubic root of 1265931264 is about 1081.7744218783.

The spelling of 1265931264 in words is "one billion, two hundred sixty-five million, nine hundred thirty-one thousand, two hundred sixty-four".