1321765608 has 16 divisors (see below), whose sum is σ = 3304414080. Its totient is φ = 440588528.

The previous prime is 1321765603. The next prime is 1321765637. The reversal of 1321765608 is 8065671231.

It is not an unprimeable number, because it can be changed into a prime (1321765603) 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, 27536760 + ... + 27536807.

It is an arithmetic number, because the mean of its divisors is an integer number (206525880).

Almost surely, 2^1321765608 is an apocalyptic number.

It is an amenable number.

1321765608 is an abundant number, since it is smaller than the sum of its proper divisors (1982648472).

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

1321765608 is a wasteful number, since it uses less digits than its factorization.

1321765608 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 55073576 (or 55073572 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 39.

The square root of 1321765608 is about 36356.0945097242. The cubic root of 1321765608 is about 1097.4501844164.

The spelling of 1321765608 in words is "one billion, three hundred twenty-one million, seven hundred sixty-five thousand, six hundred eight".