1264672778 has 8 divisors (see below), whose sum is σ = 1897211268. Its totient is φ = 632269024.

The previous prime is 1264672763. The next prime is 1264672781. The reversal of 1264672778 is 8772764621.

It can be written as a sum of positive squares in 2 ways, for example, as 1169161249 + 95511529 = 34193^2 + 9773^2 .

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

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5501 + ... + 50592.

Almost surely, 2^1264672778 is an apocalyptic number.

1264672778 is a deficient number, since it is larger than the sum of its proper divisors (632538490).

1264672778 is a wasteful number, since it uses less digits than its factorization.

1264672778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 67368.

The product of its digits is 1580544, while the sum is 50.

The square root of 1264672778 is about 35562.2380904239. The cubic root of 1264672778 is about 1081.4158322815.

The spelling of 1264672778 in words is "one billion, two hundred sixty-four million, six hundred seventy-two thousand, seven hundred seventy-eight".