1256928560 has 20 divisors (see below), whose sum is σ = 2922359088. Its totient is φ = 502771392.

The previous prime is 1256928551. The next prime is 1256928583. The reversal of 1256928560 is 658296521.

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7855724 + ... + 7855883.

Almost surely, 2^1256928560 is an apocalyptic number.

1256928560 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1256928560 is an abundant number, since it is smaller than the sum of its proper divisors (1665430528).

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

1256928560 is a wasteful number, since it uses less digits than its factorization.

1256928560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15711620 (or 15711614 counting only the distinct ones).

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

The square root of 1256928560 is about 35453.1882910409. The cubic root of 1256928560 is about 1079.2039630195.

The spelling of 1256928560 in words is "one billion, two hundred fifty-six million, nine hundred twenty-eight thousand, five hundred sixty".