1634719664 has 40 divisors (see below), whose sum is σ = 3316475232. Its totient is φ = 779102720.

The previous prime is 1634719661. The next prime is 1634719679. The reversal of 1634719664 is 4669174361.

It is not an unprimeable number, because it can be changed into a prime (1634719661) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 100244 + ... + 115404.

Almost surely, 2^1634719664 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 1634719664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1658237616).

1634719664 is an abundant number, since it is smaller than the sum of its proper divisors (1681755568).

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

1634719664 is a wasteful number, since it uses less digits than its factorization.

1634719664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15485 (or 15479 counting only the distinct ones).

The product of its digits is 653184, while the sum is 47.

The square root of 1634719664 is about 40431.6665993377. Note that the first 3 decimals coincide. The cubic root of 1634719664 is about 1178.0067046583.

The spelling of 1634719664 in words is "one billion, six hundred thirty-four million, seven hundred nineteen thousand, six hundred sixty-four".