1256477568 has 32 divisors (see below), whose sum is σ = 3337519560. Its totient is φ = 418825728.

The previous prime is 1256477539. The next prime is 1256477591. The reversal of 1256477568 is 8657746521.

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 1256477568.

It is a congruent number.

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, 1635655 + ... + 1636422.

Almost surely, 2^1256477568 is an apocalyptic number.

It is an amenable number.

1256477568 is an abundant number, since it is smaller than the sum of its proper divisors (2081041992).

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

1256477568 is an equidigital number, since it uses as much as digits as its factorization.

1256477568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3272094 (or 3272082 counting only the distinct ones).

The product of its digits is 2822400, while the sum is 51.

The square root of 1256477568 is about 35446.8273333454. The cubic root of 1256477568 is about 1079.0748730584.

The spelling of 1256477568 in words is "one billion, two hundred fifty-six million, four hundred seventy-seven thousand, five hundred sixty-eight".