1265744880 has 200 divisors, whose sum is σ = 4538649984. Its totient is φ = 326592000.

The previous prime is 1265744867. The next prime is 1265744891. The reversal of 1265744880 is 884475621.

1265744880 is a `hidden beast` number, since 126 + 5 + 7 + 448 + 80 = 666.

It is a super-2 number, since 2×1265744880² = 3204220202492428800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 197730 + ... + 204030.

Almost surely, 2^1265744880 is an apocalyptic number.

1265744880 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 1265744880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2269324992).

1265744880 is an abundant number, since it is smaller than the sum of its proper divisors (3272905104).

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

1265744880 is a wasteful number, since it uses less digits than its factorization.

1265744880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6357 (or 6342 counting only the distinct ones).

The product of its (nonzero) digits is 430080, while the sum is 45.

The square root of 1265744880 is about 35577.3084985360. The cubic root of 1265744880 is about 1081.7213291221.

The spelling of 1265744880 in words is "one billion, two hundred sixty-five million, seven hundred forty-four thousand, eight hundred eighty".