1264835778 has 16 divisors (see below), whose sum is σ = 2577401856. Its totient is φ = 413656880.

The previous prime is 1264835771. The next prime is 1264835791. The reversal of 1264835778 is 8775384621.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 1264835778.

It is not an unprimeable number, because it can be changed into a prime (1264835771) 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, 1988418 + ... + 1989053.

It is an arithmetic number, because the mean of its divisors is an integer number (161087616).

Almost surely, 2^1264835778 is an apocalyptic number.

1264835778 is an abundant number, since it is smaller than the sum of its proper divisors (1312566078).

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

1264835778 is a wasteful number, since it uses less digits than its factorization.

1264835778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3977529.

The product of its digits is 2257920, while the sum is 51.

The square root of 1264835778 is about 35564.5297733570. The cubic root of 1264835778 is about 1081.4622904671.

The spelling of 1264835778 in words is "one billion, two hundred sixty-four million, eight hundred thirty-five thousand, seven hundred seventy-eight".