1256897152 has 64 divisors (see below), whose sum is σ = 2868517440. Its totient is φ = 537384960.

The previous prime is 1256897113. The next prime is 1256897183. The reversal of 1256897152 is 2517986521.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×1256897152² = 3159580901411422208, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 438508 + ... + 441364.

It is an arithmetic number, because the mean of its divisors is an integer number (44820585).

Almost surely, 2^1256897152 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 1256897152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1434258720).

1256897152 is an abundant number, since it is smaller than the sum of its proper divisors (1611620288).

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

1256897152 is an equidigital number, since it uses as much as digits as its factorization.

1256897152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3369 (or 3357 counting only the distinct ones).

The product of its digits is 302400, while the sum is 46.

The square root of 1256897152 is about 35452.7453379848. The cubic root of 1256897152 is about 1079.1949739325.

The spelling of 1256897152 in words is "one billion, two hundred fifty-six million, eight hundred ninety-seven thousand, one hundred fifty-two".