1256028965 has 16 divisors (see below), whose sum is σ = 1590451200. Its totient is φ = 950328192.

The previous prime is 1256028931. The next prime is 1256028989. The reversal of 1256028965 is 5698206521.

It is a cyclic number.

It is not a de Polignac number, because 1256028965 - 2²⁶ = 1188920101 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 51125 + ... + 71594.

It is an arithmetic number, because the mean of its divisors is an integer number (99403200).

Almost surely, 2^1256028965 is an apocalyptic number.

It is an amenable number.

1256028965 is a deficient number, since it is larger than the sum of its proper divisors (334422235).

1256028965 is a wasteful number, since it uses less digits than its factorization.

1256028965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122836.

The product of its (nonzero) digits is 259200, while the sum is 44.

The square root of 1256028965 is about 35440.4989383615. The cubic root of 1256028965 is about 1078.9464362656.

The spelling of 1256028965 in words is "one billion, two hundred fifty-six million, twenty-eight thousand, nine hundred sixty-five".