1621697168 has 160 divisors (see below), whose sum is σ = 4041408000. Its totient is φ = 613122048.

The previous prime is 1621697137. The next prime is 1621697183. The reversal of 1621697168 is 8617961261.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 8149133 + ... + 8149331.

It is an arithmetic number, because the mean of its divisors is an integer number (25258800).

Almost surely, 2^1621697168 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 1621697168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2020704000).

1621697168 is an abundant number, since it is smaller than the sum of its proper divisors (2419710832).

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

1621697168 is a wasteful number, since it uses less digits than its factorization.

1621697168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 449 (or 443 counting only the distinct ones).

The product of its digits is 217728, while the sum is 47.

The square root of 1621697168 is about 40270.3013149889. The cubic root of 1621697168 is about 1174.8702842770.

The spelling of 1621697168 in words is "one billion, six hundred twenty-one million, six hundred ninety-seven thousand, one hundred sixty-eight".