161779332 has 96 divisors (see below), whose sum is σ = 462873600. Its totient is φ = 43274880.

The previous prime is 161779291. The next prime is 161779337. The reversal of 161779332 is 233977161.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is not an unprimeable number, because it can be changed into a prime (161779337) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37419 + ... + 41517.

It is an arithmetic number, because the mean of its divisors is an integer number (4821600).

Almost surely, 2^161779332 is an apocalyptic number.

161779332 is a gapful number since it is divisible by the number (12) 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 161779332, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (231436800).

161779332 is an abundant number, since it is smaller than the sum of its proper divisors (301094268).

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

161779332 is a wasteful number, since it uses less digits than its factorization.

161779332 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4153 (or 4151 counting only the distinct ones).

The product of its digits is 47628, while the sum is 39.

The square root of 161779332 is about 12719.2504496138. The cubic root of 161779332 is about 544.8885466337. Note that the first 3 decimals are identical.

The spelling of 161779332 in words is "one hundred sixty-one million, seven hundred seventy-nine thousand, three hundred thirty-two".