1261482778 has 16 divisors (see below), whose sum is σ = 1925283456. Its totient is φ = 619786080.

The previous prime is 1261482749. The next prime is 1261482779. The reversal of 1261482778 is 8772841621.

It is not an unprimeable number, because it can be changed into a prime (1261482779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23625 + ... + 55507.

It is an arithmetic number, because the mean of its divisors is an integer number (120330216).

Almost surely, 2^1261482778 is an apocalyptic number.

1261482778 is a deficient number, since it is larger than the sum of its proper divisors (663800678).

1261482778 is a wasteful number, since it uses less digits than its factorization.

1261482778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32229.

The product of its digits is 301056, while the sum is 46.

The square root of 1261482778 is about 35517.3588263542. The cubic root of 1261482778 is about 1080.5058153062.

The spelling of 1261482778 in words is "one billion, two hundred sixty-one million, four hundred eighty-two thousand, seven hundred seventy-eight".