1628081571920 has 30 divisors (see below), whose sum is σ = 3785316189102. Its totient is φ = 651228063744.

The previous prime is 1628081571913. The next prime is 1628081571931. The reversal of 1628081571920 is 291751808261.

It can be written as a sum of positive squares in 3 ways, for example, as 173462254144 + 1454619317776 = 416488^2 + 1206076^2 .

It is a congruent number.

It is an unprimeable number.

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 5 ways as a sum of consecutive naturals, for example, 11341232 + ... + 11483888.

Almost surely, 2^{1628081571920} is an apocalyptic number.

1628081571920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1628081571920 is an abundant number, since it is smaller than the sum of its proper divisors (2157234617182).

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

1628081571920 is an frugal number, since it uses more digits than its factorization.

1628081571920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285327 (or 142664 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 50.

The spelling of 1628081571920 in words is "one trillion, six hundred twenty-eight billion, eighty-one million, five hundred seventy-one thousand, nine hundred twenty".