1628959217 has 4 divisors (see below), whose sum is σ = 1629042660. Its totient is φ = 1628875776.

The previous prime is 1628959207. The next prime is 1628959219. The reversal of 1628959217 is 7129598261.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 550559296 + 1078399921 = 23464^2 + 32839^2 .

It is a cyclic number.

It is not a de Polignac number, because 1628959217 - 2³⁰ = 555217393 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1628959219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5009 + ... + 57297.

It is an arithmetic number, because the mean of its divisors is an integer number (407260665).

Almost surely, 2^1628959217 is an apocalyptic number.

It is an amenable number.

1628959217 is a deficient number, since it is larger than the sum of its proper divisors (83443).

1628959217 is an equidigital number, since it uses as much as digits as its factorization.

1628959217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83442.

The product of its digits is 544320, while the sum is 50.

The square root of 1628959217 is about 40360.3669086395. The cubic root of 1628959217 is about 1176.6213842550.

The spelling of 1628959217 in words is "one billion, six hundred twenty-eight million, nine hundred fifty-nine thousand, two hundred seventeen".