1628330920 has 16 divisors (see below), whose sum is σ = 3663744660. Its totient is φ = 651332352.

The previous prime is 1628330897. The next prime is 1628330939. The reversal of 1628330920 is 290338261.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 1621350756 + 6980164 = 40266^2 + 2642^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 20354097 + ... + 20354176.

Almost surely, 2^1628330920 is an apocalyptic number.

1628330920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1628330920 is an abundant number, since it is smaller than the sum of its proper divisors (2035413740).

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

1628330920 is a wasteful number, since it uses less digits than its factorization.

1628330920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40708284 (or 40708280 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 34.

The square root of 1628330920 is about 40352.5825691492. The cubic root of 1628330920 is about 1176.4700887233.

The spelling of 1628330920 in words is "one billion, six hundred twenty-eight million, three hundred thirty thousand, nine hundred twenty".