161739776 has 88 divisors (see below), whose sum is σ = 359027424. Its totient is φ = 72212480.

The previous prime is 161739701. The next prime is 161739811. The reversal of 161739776 is 677937161.

It is a tau number, because it is divible by the number of its divisors (88).

It is a self number, because there is not a number n which added to its sum of digits gives 161739776.

It is a congruent number.

It is an unprimeable number.

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, 934826 + ... + 934998.

Almost surely, 2^161739776 is an apocalyptic number.

161739776 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 161739776, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (179513712).

161739776 is an abundant number, since it is smaller than the sum of its proper divisors (197287648).

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

161739776 is a wasteful number, since it uses less digits than its factorization.

161739776 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 287 (or 269 counting only the distinct ones).

The product of its digits is 333396, while the sum is 47.

The square root of 161739776 is about 12717.6953887094. The cubic root of 161739776 is about 544.8441335269.

It can be divided in two parts, 161 and 739776, that added together give a palindrome (739937).

The spelling of 161739776 in words is "one hundred sixty-one million, seven hundred thirty-nine thousand, seven hundred seventy-six".