1691988000 has 384 divisors, whose sum is σ = 6010018560. Its totient is φ = 414720000.

The previous prime is 1691987993. The next prime is 1691988043. The reversal of 1691988000 is 8891961.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 9347910 + ... + 9348090.

It is an arithmetic number, because the mean of its divisors is an integer number (15651090).

Almost surely, 2^1691988000 is an apocalyptic number.

1691988000 is a gapful number since it is divisible by the number (10) 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 1691988000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3005009280).

1691988000 is an abundant number, since it is smaller than the sum of its proper divisors (4318030560).

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

1691988000 is a wasteful number, since it uses less digits than its factorization.

1691988000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 251 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 42.

The square root of 1691988000 is about 41133.7817371561. The cubic root of 1691988000 is about 1191.6053000060.

The spelling of 1691988000 in words is "one billion, six hundred ninety-one million, nine hundred eighty-eight thousand".