161032890 has 96 divisors (see below), whose sum is σ = 412493760. Its totient is φ = 40220928.

The previous prime is 161032873. The next prime is 161032897. The reversal of 161032890 is 98230161.

161032890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (161032897) 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, 1158441 + ... + 1158579.

It is an arithmetic number, because the mean of its divisors is an integer number (4296810).

Almost surely, 2^161032890 is an apocalyptic number.

161032890 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 161032890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (206246880).

161032890 is an abundant number, since it is smaller than the sum of its proper divisors (251460870).

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

161032890 is a wasteful number, since it uses less digits than its factorization.

161032890 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268 (or 245 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 30.

The square root of 161032890 is about 12689.8735218283. The cubic root of 161032890 is about 544.0492246583.

The spelling of 161032890 in words is "one hundred sixty-one million, thirty-two thousand, eight hundred ninety".