1264393128 has 32 divisors (see below), whose sum is σ = 3214562400. Its totient is φ = 414320448.

The previous prime is 1264393121. The next prime is 1264393159. The reversal of 1264393128 is 8213934621.

It is not an unprimeable number, because it can be changed into a prime (1264393121) 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, 445051 + ... + 447882.

It is an arithmetic number, because the mean of its divisors is an integer number (100455075).

Almost surely, 2^1264393128 is an apocalyptic number.

It is an amenable number.

1264393128 is an abundant number, since it is smaller than the sum of its proper divisors (1950169272).

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

1264393128 is a wasteful number, since it uses less digits than its factorization.

1264393128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 893001 (or 892997 counting only the distinct ones).

The product of its digits is 62208, while the sum is 39.

The square root of 1264393128 is about 35558.3060338931. The cubic root of 1264393128 is about 1081.3361172658.

The spelling of 1264393128 in words is "one billion, two hundred sixty-four million, three hundred ninety-three thousand, one hundred twenty-eight".