161898576 has 80 divisors (see below), whose sum is σ = 481302528. Its totient is φ = 45936000.

The previous prime is 161898559. The next prime is 161898617. The reversal of 161898576 is 675898161.

It is a super-2 number, since 2×161898576² = 52422297821655552, which contains 22 as substring.

Its product of digits (725760) is a multiple of the sum of its prime factors (3360).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 49141 + ... + 52331.

Almost surely, 2^161898576 is an apocalyptic number.

161898576 is a gapful number since it is divisible by the number (16) 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 161898576, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (240651264).

161898576 is an abundant number, since it is smaller than the sum of its proper divisors (319403952).

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

161898576 is a wasteful number, since it uses less digits than its factorization.

161898576 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3360 (or 3354 counting only the distinct ones).

The product of its digits is 725760, while the sum is 51.

The square root of 161898576 is about 12723.9371265344. The cubic root of 161898576 is about 545.0223888903.

The spelling of 161898576 in words is "one hundred sixty-one million, eight hundred ninety-eight thousand, five hundred seventy-six".