1631999928 has 64 divisors (see below), whose sum is σ = 4421964960. Its totient is φ = 498940416.

The previous prime is 1631999923. The next prime is 1631999953. The reversal of 1631999928 is 8299991361.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1631999921) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32326 + ... + 65642.

Almost surely, 2^1631999928 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1631999928, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2210982480).

1631999928 is an abundant number, since it is smaller than the sum of its proper divisors (2789965032).

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

1631999928 is a wasteful number, since it uses less digits than its factorization.

1631999928 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33496 (or 33492 counting only the distinct ones).

The product of its digits is 1889568, while the sum is 57.

The square root of 1631999928 is about 40398.0188623155. The cubic root of 1631999928 is about 1177.3530460627.

The spelling of 1631999928 in words is "one billion, six hundred thirty-one million, nine hundred ninety-nine thousand, nine hundred twenty-eight".