1256028756 has 12 divisors (see below), whose sum is σ = 2930733792. Its totient is φ = 418676248.

The previous prime is 1256028743. The next prime is 1256028779. The reversal of 1256028756 is 6578206521.

It is a tau number, because it is divible by the number of its divisors (12).

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52334520 + ... + 52334543.

It is an arithmetic number, because the mean of its divisors is an integer number (244227816).

Almost surely, 2^1256028756 is an apocalyptic number.

It is an amenable number.

1256028756 is an abundant number, since it is smaller than the sum of its proper divisors (1674705036).

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

1256028756 is a wasteful number, since it uses less digits than its factorization.

1256028756 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104669070 (or 104669068 counting only the distinct ones).

The product of its (nonzero) digits is 201600, while the sum is 42.

The square root of 1256028756 is about 35440.4959897573. The cubic root of 1256028756 is about 1078.9463764210.

The spelling of 1256028756 in words is "one billion, two hundred fifty-six million, twenty-eight thousand, seven hundred fifty-six".