1256545312 has 72 divisors (see below), whose sum is σ = 2782766448. Its totient is φ = 557800320.

The previous prime is 1256545267. The next prime is 1256545331. The reversal of 1256545312 is 2135456521.

It is a super-2 number, since 2×1256545312² = 3157812242218354688, which contains 22 as substring.

It is a hoax number, since the sum of its digits (34) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 162723 + ... + 170269.

It is an arithmetic number, because the mean of its divisors is an integer number (38649534).

Almost surely, 2^1256545312 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1256545312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1391383224).

1256545312 is an abundant number, since it is smaller than the sum of its proper divisors (1526221136).

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

1256545312 is a wasteful number, since it uses less digits than its factorization.

1256545312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7622 (or 7603 counting only the distinct ones).

The product of its digits is 36000, while the sum is 34.

The square root of 1256545312 is about 35447.7828925872. The cubic root of 1256545312 is about 1079.0942657735.

The spelling of 1256545312 in words is "one billion, two hundred fifty-six million, five hundred forty-five thousand, three hundred twelve".