1994609664 has 176 divisors, whose sum is σ = 6219604800. Its totient is φ = 629710848.

The previous prime is 1994609663. The next prime is 1994609693. The reversal of 1994609664 is 4669064991.

1994609664 is a `hidden beast` number, since 1 + 99 + 460 + 96 + 6 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a self number, because there is not a number n which added to its sum of digits gives 1994609664.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1994609663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 523414 + ... + 527210.

Almost surely, 2^1994609664 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1994609664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3109802400).

1994609664 is an abundant number, since it is smaller than the sum of its proper divisors (4224995136).

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

1994609664 is a wasteful number, since it uses less digits than its factorization.

1994609664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3845 (or 3821 counting only the distinct ones).

The product of its (nonzero) digits is 2519424, while the sum is 54.

The square root of 1994609664 is about 44661.0530999886. The cubic root of 1994609664 is about 1258.7881318509.

The spelling of 1994609664 in words is "one billion, nine hundred ninety-four million, six hundred nine thousand, six hundred sixty-four".