1608721672 has 16 divisors (see below), whose sum is σ = 3018825900. Its totient is φ = 803701440.

The previous prime is 1608721663. The next prime is 1608721711. The reversal of 1608721672 is 2761278061.

It can be written as a sum of positive squares in 2 ways, for example, as 1605284356 + 3437316 = 40066^2 + 1854^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71979 + ... + 91642.

Almost surely, 2^1608721672 is an apocalyptic number.

It is an amenable number.

1608721672 is a deficient number, since it is larger than the sum of its proper divisors (1410104228).

1608721672 is a wasteful number, since it uses less digits than its factorization.

1608721672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 164856 (or 164852 counting only the distinct ones).

The product of its (nonzero) digits is 56448, while the sum is 40.

The square root of 1608721672 is about 40108.8727340971. The cubic root of 1608721672 is about 1171.7284390644.

The spelling of 1608721672 in words is "one billion, six hundred eight million, seven hundred twenty-one thousand, six hundred seventy-two".