1280715264 has 120 divisors (see below), whose sum is σ = 3913895700. Its totient is φ = 401768448.

The previous prime is 1280715263. The next prime is 1280715283. The reversal of 1280715264 is 4625170821.

1280715264 is a `hidden beast` number, since 128 + 0 + 7 + 1 + 526 + 4 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 1278777600 + 1937664 = 35760^2 + 1392^2 .

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

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

It is not an unprimeable number, because it can be changed into a prime (1280715263) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 70162 + ... + 86510.

Almost surely, 2^1280715264 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 1280715264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1956947850).

1280715264 is an abundant number, since it is smaller than the sum of its proper divisors (2633180436).

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

1280715264 is a wasteful number, since it uses less digits than its factorization.

1280715264 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16390 (or 16371 counting only the distinct ones).

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

The square root of 1280715264 is about 35787.0823622156. The cubic root of 1280715264 is about 1085.9692511872.

The spelling of 1280715264 in words is "one billion, two hundred eighty million, seven hundred fifteen thousand, two hundred sixty-four".