1629664220 has 24 divisors (see below), whose sum is σ = 3443297424. Its totient is φ = 647865216.

The previous prime is 1629664199. The next prime is 1629664237. The reversal of 1629664220 is 224669261.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 246689 + ... + 253208.

It is an arithmetic number, because the mean of its divisors is an integer number (143470726).

Almost surely, 2^1629664220 is an apocalyptic number.

1629664220 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1629664220 is an abundant number, since it is smaller than the sum of its proper divisors (1813633204).

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

1629664220 is a wasteful number, since it uses less digits than its factorization.

1629664220 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 500069 (or 500067 counting only the distinct ones).

The product of its (nonzero) digits is 62208, while the sum is 38.

The square root of 1629664220 is about 40369.0998165676. The cubic root of 1629664220 is about 1176.7911044779.

The spelling of 1629664220 in words is "one billion, six hundred twenty-nine million, six hundred sixty-four thousand, two hundred twenty".