1255717644 has 24 divisors (see below), whose sum is σ = 2971277568. Its totient is φ = 412676880.

The previous prime is 1255717633. The next prime is 1255717649. The reversal of 1255717644 is 4467175521.

It is a junction number, because it is equal to n+sod(n) for n = 1255717596 and 1255717605.

It is not an unprimeable number, because it can be changed into a prime (1255717649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 736072 + ... + 737775.

It is an arithmetic number, because the mean of its divisors is an integer number (123803232).

Almost surely, 2^1255717644 is an apocalyptic number.

It is an amenable number.

1255717644 is an abundant number, since it is smaller than the sum of its proper divisors (1715559924).

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

1255717644 is a wasteful number, since it uses less digits than its factorization.

1255717644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1473925 (or 1473923 counting only the distinct ones).

The product of its digits is 235200, while the sum is 42.

The square root of 1255717644 is about 35436.1065017025. The cubic root of 1255717644 is about 1078.8572858695.

The spelling of 1255717644 in words is "one billion, two hundred fifty-five million, seven hundred seventeen thousand, six hundred forty-four".