1295668728 has 48 divisors (see below), whose sum is σ = 3630112200. Its totient is φ = 416996160.

The previous prime is 1295668727. The next prime is 1295668741. The reversal of 1295668728 is 8278665921.

1295668728 is a `hidden beast` number, since 1 + 2 + 9 + 566 + 8 + 72 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1295668723) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 308178 + ... + 312353.

Almost surely, 2^1295668728 is an apocalyptic number.

1295668728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1295668728 is an abundant number, since it is smaller than the sum of its proper divisors (2334443472).

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

1295668728 is a wasteful number, since it uses less digits than its factorization.

1295668728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 620572 (or 620565 counting only the distinct ones).

The product of its digits is 2903040, while the sum is 54.

The square root of 1295668728 is about 35995.3987059457. The cubic root of 1295668728 is about 1090.1794525404.

The spelling of 1295668728 in words is "one billion, two hundred ninety-five million, six hundred sixty-eight thousand, seven hundred twenty-eight".