1296716328 has 24 divisors (see below), whose sum is σ = 3511940250. Its totient is φ = 432238752.

The previous prime is 1296716321. The next prime is 1296716339. The reversal of 1296716328 is 8236176921.

1296716328 is a `hidden beast` number, since 1 + 2 + 9 + 6 + 7 + 1 + 632 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 1023872004 + 272844324 = 31998^2 + 16518^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1296716321) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9004903 + ... + 9005046.

Almost surely, 2^1296716328 is an apocalyptic number.

1296716328 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

1296716328 is an abundant number, since it is smaller than the sum of its proper divisors (2215223922).

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

1296716328 is a wasteful number, since it uses less digits than its factorization.

1296716328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18009961 (or 18009954 counting only the distinct ones).

The product of its digits is 217728, while the sum is 45.

The square root of 1296716328 is about 36009.9476256215. The cubic root of 1296716328 is about 1090.4731912882.

The spelling of 1296716328 in words is "one billion, two hundred ninety-six million, seven hundred sixteen thousand, three hundred twenty-eight".