1265858880 has 224 divisors, whose sum is σ = 4722254208. Its totient is φ = 283238400.

The previous prime is 1265858861. The next prime is 1265858921. The reversal of 1265858880 is 888585621.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 132670 + ... + 141890.

It is an arithmetic number, because the mean of its divisors is an integer number (21081492).

Almost surely, 2^1265858880 is an apocalyptic number.

1265858880 is a gapful number since it is divisible by the number (10) 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 1265858880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2361127104).

1265858880 is an abundant number, since it is smaller than the sum of its proper divisors (3456395328).

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

1265858880 is a wasteful number, since it uses less digits than its factorization.

1265858880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9265 (or 9255 counting only the distinct ones).

The product of its (nonzero) digits is 1228800, while the sum is 51.

The square root of 1265858880 is about 35578.9106072685. The cubic root of 1265858880 is about 1081.7538034202.

The spelling of 1265858880 in words is "one billion, two hundred sixty-five million, eight hundred fifty-eight thousand, eight hundred eighty".