1629728885 has 16 divisors (see below), whose sum is σ = 2121224112. Its totient is φ = 1197158400.

The previous prime is 1629728879. The next prime is 1629728911. The reversal of 1629728885 is 5888279261.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 9746884 + 1619982001 = 3122^2 + 40249^2 .

It is not a de Polignac number, because 1629728885 - 2¹⁶ = 1629663349 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 1629728885.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 230336 + ... + 237305.

It is an arithmetic number, because the mean of its divisors is an integer number (132576507).

Almost surely, 2^1629728885 is an apocalyptic number.

It is an amenable number.

1629728885 is a deficient number, since it is larger than the sum of its proper divisors (491495227).

1629728885 is a wasteful number, since it uses less digits than its factorization.

1629728885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 467704.

The product of its digits is 3870720, while the sum is 56.

The square root of 1629728885 is about 40369.9007306186. The cubic root of 1629728885 is about 1176.8066692773.

The spelling of 1629728885 in words is "one billion, six hundred twenty-nine million, seven hundred twenty-eight thousand, eight hundred eighty-five".