1328709525 has 96 divisors (see below), whose sum is σ = 2596917120. Its totient is φ = 590976000.

The previous prime is 1328709521. The next prime is 1328709527. The reversal of 1328709525 is 5259078231.

It is a happy number.

It is not a de Polignac number, because 1328709525 - 2² = 1328709521 is a prime.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328709521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 2455755 + ... + 2456295.

It is an arithmetic number, because the mean of its divisors is an integer number (27051220).

Almost surely, 2^1328709525 is an apocalyptic number.

1328709525 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

1328709525 is a deficient number, since it is larger than the sum of its proper divisors (1268207595).

1328709525 is a wasteful number, since it uses less digits than its factorization.

1328709525 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 807 (or 802 counting only the distinct ones).

The product of its (nonzero) digits is 151200, while the sum is 42.

The square root of 1328709525 is about 36451.4680774314. The cubic root of 1328709525 is about 1099.3686528579.

The spelling of 1328709525 in words is "one billion, three hundred twenty-eight million, seven hundred nine thousand, five hundred twenty-five".