1280535264 has 48 divisors (see below), whose sum is σ = 3734897040. Its totient is φ = 426844800.

The previous prime is 1280535239. The next prime is 1280535287. The reversal of 1280535264 is 4625350821.

1280535264 is a `hidden beast` number, since 1 + 2 + 80 + 53 + 526 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (48).

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

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 7 ways as a sum of consecutive naturals, for example, 740187 + ... + 741914.

It is an arithmetic number, because the mean of its divisors is an integer number (77810355).

Almost surely, 2^1280535264 is an apocalyptic number.

It is an amenable number.

1280535264 is an abundant number, since it is smaller than the sum of its proper divisors (2454361776).

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

1280535264 is a wasteful number, since it uses less digits than its factorization.

1280535264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1482120 (or 1482106 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 1280535264 is about 35784.5673999281. The cubic root of 1280535264 is about 1085.9183724246.

The spelling of 1280535264 in words is "one billion, two hundred eighty million, five hundred thirty-five thousand, two hundred sixty-four".