1256648478 has 16 divisors (see below), whose sum is σ = 2514464256. Its totient is φ = 418688280.

The previous prime is 1256648443. The next prime is 1256648509. The reversal of 1256648478 is 8748466521.

It is a self number, because there is not a number n which added to its sum of digits gives 1256648478.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34318 + ... + 60753.

It is an arithmetic number, because the mean of its divisors is an integer number (157154016).

Almost surely, 2^1256648478 is an apocalyptic number.

1256648478 is an abundant number, since it is smaller than the sum of its proper divisors (1257815778).

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

1256648478 is a wasteful number, since it uses less digits than its factorization.

1256648478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97279.

The product of its digits is 2580480, while the sum is 51.

The square root of 1256648478 is about 35449.2380454080. The cubic root of 1256648478 is about 1079.1237972174.

The spelling of 1256648478 in words is "one billion, two hundred fifty-six million, six hundred forty-eight thousand, four hundred seventy-eight".