1629391664 has 20 divisors (see below), whose sum is σ = 3323102040. Its totient is φ = 771816960.

The previous prime is 1629391663. The next prime is 1629391703. The reversal of 1629391664 is 4661939261.

It is a happy number.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (1629391663) 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 3 ways as a sum of consecutive naturals, for example, 2679617 + ... + 2680224.

It is an arithmetic number, because the mean of its divisors is an integer number (166155102).

Almost surely, 2^1629391664 is an apocalyptic number.

It is an amenable number.

1629391664 is an abundant number, since it is smaller than the sum of its proper divisors (1693710376).

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

1629391664 is a wasteful number, since it uses less digits than its factorization.

1629391664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5359868 (or 5359862 counting only the distinct ones).

The product of its digits is 419904, while the sum is 47.

The square root of 1629391664 is about 40365.7238755853. The cubic root of 1629391664 is about 1176.7254960016.

The spelling of 1629391664 in words is "one billion, six hundred twenty-nine million, three hundred ninety-one thousand, six hundred sixty-four".