1256648136 has 16 divisors (see below), whose sum is σ = 3141620400. Its totient is φ = 418882704.

The previous prime is 1256648117. The next prime is 1256648153. The reversal of 1256648136 is 6318466521.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26180146 + ... + 26180193.

It is an arithmetic number, because the mean of its divisors is an integer number (196351275).

Almost surely, 2^1256648136 is an apocalyptic number.

It is an amenable number.

1256648136 is an abundant number, since it is smaller than the sum of its proper divisors (1884972264).

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

1256648136 is a wasteful number, since it uses less digits than its factorization.

1256648136 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 52360348 (or 52360344 counting only the distinct ones).

The product of its digits is 207360, while the sum is 42.

The square root of 1256648136 is about 35449.2332216086. The cubic root of 1256648136 is about 1079.1236993220.

The spelling of 1256648136 in words is "one billion, two hundred fifty-six million, six hundred forty-eight thousand, one hundred thirty-six".