1264378668 has 48 divisors (see below), whose sum is σ = 3373843200. Its totient is φ = 361018944.

The previous prime is 1264378667. The next prime is 1264378691. The reversal of 1264378668 is 8668734621.

It is a self number, because there is not a number n which added to its sum of digits gives 1264378668.

It is not an unprimeable number, because it can be changed into a prime (1264378667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 159855 + ... + 167577.

It is an arithmetic number, because the mean of its divisors is an integer number (70288400).

Almost surely, 2^1264378668 is an apocalyptic number.

It is an amenable number.

1264378668 is an abundant number, since it is smaller than the sum of its proper divisors (2109464532).

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

1264378668 is a wasteful number, since it uses less digits than its factorization.

1264378668 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9686 (or 9684 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 51.

The square root of 1264378668 is about 35558.1027052907. The cubic root of 1264378668 is about 1081.3319950827.

The spelling of 1264378668 in words is "one billion, two hundred sixty-four million, three hundred seventy-eight thousand, six hundred sixty-eight".