161039776 has 48 divisors (see below), whose sum is σ = 337002120. Its totient is φ = 75489280.

The previous prime is 161039771. The next prime is 161039783. The reversal of 161039776 is 677930161.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 86044176 + 74995600 = 9276^2 + 8660^2 .

It is not an unprimeable number, because it can be changed into a prime (161039771) 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 7 ways as a sum of consecutive naturals, for example, 211236 + ... + 211996.

Almost surely, 2^161039776 is an apocalyptic number.

161039776 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 161039776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (168501060).

161039776 is an abundant number, since it is smaller than the sum of its proper divisors (175962344).

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

161039776 is a wasteful number, since it uses less digits than its factorization.

161039776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1177 (or 1169 counting only the distinct ones).

The product of its (nonzero) digits is 47628, while the sum is 40.

The square root of 161039776 is about 12690.1448376289. The cubic root of 161039776 is about 544.0569793258.

The spelling of 161039776 in words is "one hundred sixty-one million, thirty-nine thousand, seven hundred seventy-six".