1256504312 has 64 divisors (see below), whose sum is σ = 2775453120. Its totient is φ = 522021888.

The previous prime is 1256504311. The next prime is 1256504393. The reversal of 1256504312 is 2134056521.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1256504311) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 655868 + ... + 657780.

It is an arithmetic number, because the mean of its divisors is an integer number (43366455).

Almost surely, 2^1256504312 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 1256504312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1387726560).

1256504312 is an abundant number, since it is smaller than the sum of its proper divisors (1518948808).

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

1256504312 is a wasteful number, since it uses less digits than its factorization.

1256504312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2280 (or 2276 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

The square root of 1256504312 is about 35447.2045724342. The cubic root of 1256504312 is about 1079.0825290045.

The spelling of 1256504312 in words is "one billion, two hundred fifty-six million, five hundred four thousand, three hundred twelve".