1265353264 has 60 divisors (see below), whose sum is σ = 2860193424. Its totient is φ = 540715392.

The previous prime is 1265353171. The next prime is 1265353283. The reversal of 1265353264 is 4623535621.

It is a super-2 number, since 2×1265353264² = 3202237765430907392, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 290269 + ... + 294595.

Almost surely, 2^1265353264 is an apocalyptic number.

1265353264 is a gapful number since it is divisible by the number (14) 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 1265353264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1430096712).

1265353264 is an abundant number, since it is smaller than the sum of its proper divisors (1594840160).

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

1265353264 is a wasteful number, since it uses less digits than its factorization.

1265353264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4722 (or 4709 counting only the distinct ones).

The product of its digits is 129600, while the sum is 37.

The square root of 1265353264 is about 35571.8043399544. The cubic root of 1265353264 is about 1081.6097576454.

Adding to 1265353264 its reverse (4623535621), we get a palindrome (5888888885).

The spelling of 1265353264 in words is "one billion, two hundred sixty-five million, three hundred fifty-three thousand, two hundred sixty-four".