161883810 has 96 divisors (see below), whose sum is σ = 463993920. Its totient is φ = 38832000.

The previous prime is 161883793. The next prime is 161883811. The reversal of 161883810 is 18388161.

161883810 is a `hidden beast` number, since 1 + 618 + 8 + 38 + 1 + 0 = 666.

It is a super-2 number, since 2×161883810² = 52412735880232200, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (161883811) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 99181 + ... + 100799.

It is an arithmetic number, because the mean of its divisors is an integer number (4833270).

Almost surely, 2^161883810 is an apocalyptic number.

161883810 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 161883810, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231996960).

161883810 is an abundant number, since it is smaller than the sum of its proper divisors (302110110).

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

161883810 is a wasteful number, since it uses less digits than its factorization.

161883810 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1744 (or 1741 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 36.

The square root of 161883810 is about 12723.3568683740. The cubic root of 161883810 is about 545.0058187522.

The spelling of 161883810 in words is "one hundred sixty-one million, eight hundred eighty-three thousand, eight hundred ten".