161987076 has 36 divisors (see below), whose sum is σ = 410482800. Its totient is φ = 53861808.

The previous prime is 161987071. The next prime is 161987093. The reversal of 161987076 is 670789161.

It is a tau number, because it is divible by the number of its divisors (36).

It is not an unprimeable number, because it can be changed into a prime (161987071) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 9715 + ... + 20453.

It is an arithmetic number, because the mean of its divisors is an integer number (11402300).

Almost surely, 2^161987076 is an apocalyptic number.

It is an amenable number.

161987076 is an abundant number, since it is smaller than the sum of its proper divisors (248495724).

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

161987076 is a wasteful number, since it uses less digits than its factorization.

161987076 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11168 (or 11163 counting only the distinct ones).

The product of its (nonzero) digits is 127008, while the sum is 45.

The square root of 161987076 is about 12727.4143485627. The cubic root of 161987076 is about 545.1216808798.

The spelling of 161987076 in words is "one hundred sixty-one million, nine hundred eighty-seven thousand, seventy-six".