1999001628 has 108 divisors (see below), whose sum is σ = 5759939640. Its totient is φ = 582671232.

The previous prime is 1999001611. The next prime is 1999001671. The reversal of 1999001628 is 8261009991.

1999001628 is a `hidden beast` number, since 19 + 9 + 9 + 0 + 0 + 1 + 628 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 106950 + ... + 124242.

Almost surely, 2^1999001628 is an apocalyptic number.

1999001628 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1999001628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2879969820).

1999001628 is an abundant number, since it is smaller than the sum of its proper divisors (3760938012).

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

1999001628 is a wasteful number, since it uses less digits than its factorization.

1999001628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17348 (or 17330 counting only the distinct ones).

The product of its (nonzero) digits is 69984, while the sum is 45.

The square root of 1999001628 is about 44710.1960183580. The cubic root of 1999001628 is about 1259.7113700182.

The spelling of 1999001628 in words is "one billion, nine hundred ninety-nine million, one thousand, six hundred twenty-eight".