161650128 has 20 divisors (see below), whose sum is σ = 417596288. Its totient is φ = 53883360.

The previous prime is 161650121. The next prime is 161650133. The reversal of 161650128 is 821056161.

It is a super-2 number, since 2×161650128² = 52261527764832768, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 161650095 and 161650104.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (161650121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1683808 + ... + 1683903.

Almost surely, 2^161650128 is an apocalyptic number.

It is an amenable number.

161650128 is an abundant number, since it is smaller than the sum of its proper divisors (255946160).

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

161650128 is a wasteful number, since it uses less digits than its factorization.

161650128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3367722 (or 3367716 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 30.

The square root of 161650128 is about 12714.1703622376. The cubic root of 161650128 is about 544.7434507817.

The spelling of 161650128 in words is "one hundred sixty-one million, six hundred fifty thousand, one hundred twenty-eight".