1328988061 has 4 divisors (see below), whose sum is σ = 1329112224. Its totient is φ = 1328863900.

The previous prime is 1328988053. The next prime is 1328988077. The reversal of 1328988061 is 1608898231.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 1328988061 - 2³ = 1328988053 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1328958061) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44335 + ... + 67996.

It is an arithmetic number, because the mean of its divisors is an integer number (332278056).

Almost surely, 2^1328988061 is an apocalyptic number.

It is an amenable number.

1328988061 is a deficient number, since it is larger than the sum of its proper divisors (124163).

1328988061 is a wasteful number, since it uses less digits than its factorization.

1328988061 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 124162.

The product of its (nonzero) digits is 165888, while the sum is 46.

The square root of 1328988061 is about 36455.2885189515. The cubic root of 1328988061 is about 1099.4454673276.

The spelling of 1328988061 in words is "one billion, three hundred twenty-eight million, nine hundred eighty-eight thousand, sixty-one".