1265741280 has 72 divisors (see below), whose sum is σ = 4319347032. Its totient is φ = 337530624.

The previous prime is 1265741231. The next prime is 1265741293. The reversal of 1265741280 is 821475621.

1265741280 is a `hidden beast` number, since 1 + 2 + 6 + 574 + 1 + 2 + 80 = 666.

1265741280 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

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, 438054 + ... + 440933.

It is an arithmetic number, because the mean of its divisors is an integer number (59990931).

Almost surely, 2^1265741280 is an apocalyptic number.

1265741280 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1265741280 is an abundant number, since it is smaller than the sum of its proper divisors (3053605752).

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

1265741280 is a wasteful number, since it uses less digits than its factorization.

1265741280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 879008 (or 878997 counting only the distinct ones).

The product of its (nonzero) digits is 26880, while the sum is 36.

The square root of 1265741280 is about 35577.2579044535. The cubic root of 1265741280 is about 1081.7203035862.

The spelling of 1265741280 in words is "one billion, two hundred sixty-five million, seven hundred forty-one thousand, two hundred eighty".