1256091264 has 96 divisors (see below), whose sum is σ = 3625602240. Its totient is φ = 417415680.

The previous prime is 1256091259. The next prime is 1256091337. The reversal of 1256091264 is 4621906521.

1256091264 is a `hidden beast` number, since 1 + 2 + 560 + 91 + 2 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (96).

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 11 ways as a sum of consecutive naturals, for example, 421299 + ... + 424269.

It is an arithmetic number, because the mean of its divisors is an integer number (37766690).

Almost surely, 2^1256091264 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 1256091264, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1812801120).

1256091264 is an abundant number, since it is smaller than the sum of its proper divisors (2369510976).

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

1256091264 is a wasteful number, since it uses less digits than its factorization.

1256091264 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3358 (or 3343 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 1256091264 is about 35441.3778513195. The cubic root of 1256091264 is about 1078.9642745413.

Adding to 1256091264 its reverse (4621906521), we get a palindrome (5877997785).

The spelling of 1256091264 in words is "one billion, two hundred fifty-six million, ninety-one thousand, two hundred sixty-four".