1256860128 has 48 divisors (see below), whose sum is σ = 3328483536. Its totient is φ = 415242240.

The previous prime is 1256860103. The next prime is 1256860151. The reversal of 1256860128 is 8210686521.

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

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, 47083 + ... + 68778.

It is an arithmetic number, because the mean of its divisors is an integer number (69343407).

Almost surely, 2^1256860128 is an apocalyptic number.

It is an amenable number.

1256860128 is an abundant number, since it is smaller than the sum of its proper divisors (2071623408).

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

1256860128 is a wasteful number, since it uses less digits than its factorization.

1256860128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 115987 (or 115979 counting only the distinct ones).

The product of its (nonzero) digits is 46080, while the sum is 39.

The square root of 1256860128 is about 35452.2231742947. The cubic root of 1256860128 is about 1079.1843773331.

The spelling of 1256860128 in words is "one billion, two hundred fifty-six million, eight hundred sixty thousand, one hundred twenty-eight".