1609631964 has 18 divisors (see below), whose sum is σ = 4068792000. Its totient is φ = 536543976.

The previous prime is 1609631953. The next prime is 1609631971. The reversal of 1609631964 is 4691369061.

1609631964 is a `hidden beast` number, since 1 + 6 + 0 + 9 + 631 + 9 + 6 + 4 = 666.

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 22355964 + ... + 22356035.

It is an arithmetic number, because the mean of its divisors is an integer number (226044000).

Almost surely, 2^1609631964 is an apocalyptic number.

It is an amenable number.

1609631964 is an abundant number, since it is smaller than the sum of its proper divisors (2459160036).

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

1609631964 is a wasteful number, since it uses less digits than its factorization.

1609631964 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44712009 (or 44712004 counting only the distinct ones).

The product of its (nonzero) digits is 209952, while the sum is 45.

The square root of 1609631964 is about 40120.2188927229. The cubic root of 1609631964 is about 1171.9494041377.

The spelling of 1609631964 in words is "one billion, six hundred nine million, six hundred thirty-one thousand, nine hundred sixty-four".