1256732772 has 12 divisors (see below), whose sum is σ = 2932376496. Its totient is φ = 418910920.

The previous prime is 1256732753. The next prime is 1256732773. The reversal of 1256732772 is 2772376521.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (1256732773) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 52363854 + ... + 52363877.

It is an arithmetic number, because the mean of its divisors is an integer number (244364708).

Almost surely, 2^1256732772 is an apocalyptic number.

1256732772 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

1256732772 is an abundant number, since it is smaller than the sum of its proper divisors (1675643724).

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

1256732772 is a wasteful number, since it uses less digits than its factorization.

1256732772 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104727738 (or 104727736 counting only the distinct ones).

The product of its digits is 246960, while the sum is 42.

The square root of 1256732772 is about 35450.4269649887. The cubic root of 1256732772 is about 1079.1479253193.

The spelling of 1256732772 in words is "one billion, two hundred fifty-six million, seven hundred thirty-two thousand, seven hundred seventy-two".