1280751264 has 240 divisors, whose sum is σ = 4098124800. Its totient is φ = 390044160.

The previous prime is 1280751257. The next prime is 1280751299. The reversal of 1280751264 is 4621570821.

1280751264 is a `hidden beast` number, since 1 + 2 + 80 + 7 + 512 + 64 = 666.

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

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, 6435837 + ... + 6436035.

It is an arithmetic number, because the mean of its divisors is an integer number (17075520).

Almost surely, 2^1280751264 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 1280751264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2049062400).

1280751264 is an abundant number, since it is smaller than the sum of its proper divisors (2817373536).

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

1280751264 is a wasteful number, since it uses less digits than its factorization.

1280751264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425 (or 408 counting only the distinct ones).

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

The square root of 1280751264 is about 35787.5853334645. The cubic root of 1280751264 is about 1085.9794263677.

The spelling of 1280751264 in words is "one billion, two hundred eighty million, seven hundred fifty-one thousand, two hundred sixty-four".