1265187264 has 112 divisors (see below), whose sum is σ = 3706709376. Its totient is φ = 377625600.

The previous prime is 1265187241. The next prime is 1265187281. The reversal of 1265187264 is 4627815621.

It is a happy number.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 137034 + ... + 145974.

Almost surely, 2^1265187264 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 1265187264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1853354688).

1265187264 is an abundant number, since it is smaller than the sum of its proper divisors (2441522112).

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

1265187264 is a wasteful number, since it uses less digits than its factorization.

1265187264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9034 (or 9024 counting only the distinct ones).

The product of its digits is 161280, while the sum is 42.

The square root of 1265187264 is about 35569.4709547387. The cubic root of 1265187264 is about 1081.5624572651.

The spelling of 1265187264 in words is "one billion, two hundred sixty-five million, one hundred eighty-seven thousand, two hundred sixty-four".