1264145128 has 32 divisors (see below), whose sum is σ = 2453177160. Its totient is φ = 610283520.

The previous prime is 1264145101. The next prime is 1264145137. The reversal of 1264145128 is 8215414621.

It can be written as a sum of positive squares in 4 ways, for example, as 1050926724 + 213218404 = 32418^2 + 14602^2 .

It is a super-2 number, since 2×1264145128² = 3196125809292272768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 1264145093 and 1264145102.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11950 + ... + 51682.

Almost surely, 2^1264145128 is an apocalyptic number.

It is an amenable number.

1264145128 is a deficient number, since it is larger than the sum of its proper divisors (1189032032).

1264145128 is a wasteful number, since it uses less digits than its factorization.

1264145128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 39877 (or 39873 counting only the distinct ones).

The product of its digits is 15360, while the sum is 34.

The square root of 1264145128 is about 35554.8186326411. The cubic root of 1264145128 is about 1081.2654143369.

Adding to 1264145128 its reverse (8215414621), we get a palindrome (9479559749).

The spelling of 1264145128 in words is "one billion, two hundred sixty-four million, one hundred forty-five thousand, one hundred twenty-eight".