161530880 has 88 divisors (see below), whose sum is σ = 442938048. Its totient is φ = 55369728.

The previous prime is 161530879. The next prime is 161530907. The reversal of 161530880 is 88035161.

It is a Harshad number since it is a multiple of its sum of digits (32).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33587 + ... + 38093.

Almost surely, 2^161530880 is an apocalyptic number.

161530880 is a gapful number since it is divisible by the number (10) 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 161530880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (221469024).

161530880 is an abundant number, since it is smaller than the sum of its proper divisors (281407168).

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

161530880 is an equidigital number, since it uses as much as digits as its factorization.

161530880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4539 (or 4521 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 32.

The square root of 161530880 is about 12709.4799264171. The cubic root of 161530880 is about 544.6094668751.

The spelling of 161530880 in words is "one hundred sixty-one million, five hundred thirty thousand, eight hundred eighty".