1261256078 has 8 divisors (see below), whose sum is σ = 2003171472. Its totient is φ = 593532256.

The previous prime is 1261256071. The next prime is 1261256089. The reversal of 1261256078 is 8706521621.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1261256071) by changing a digit.

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, 18547850 + ... + 18547917.

It is an arithmetic number, because the mean of its divisors is an integer number (250396434).

Almost surely, 2^1261256078 is an apocalyptic number.

1261256078 is a deficient number, since it is larger than the sum of its proper divisors (741915394).

1261256078 is a wasteful number, since it uses less digits than its factorization.

1261256078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37095786.

The product of its (nonzero) digits is 40320, while the sum is 38.

The square root of 1261256078 is about 35514.1672857467. The cubic root of 1261256078 is about 1080.4410858340.

Adding to 1261256078 its reverse (8706521621), we get a palindrome (9967777699).

The spelling of 1261256078 in words is "one billion, two hundred sixty-one million, two hundred fifty-six thousand, seventy-eight".