161776140 has 48 divisors (see below), whose sum is σ = 461528928. Its totient is φ = 42325504.

The previous prime is 161776093. The next prime is 161776151. The reversal of 161776140 is 41677161.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 22257 + ... + 28616.

It is an arithmetic number, because the mean of its divisors is an integer number (9615186).

Almost surely, 2^161776140 is an apocalyptic number.

161776140 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

161776140 is an abundant number, since it is smaller than the sum of its proper divisors (299752788).

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

161776140 is a wasteful number, since it uses less digits than its factorization.

161776140 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50938 (or 50936 counting only the distinct ones).

The product of its (nonzero) digits is 7056, while the sum is 33.

The square root of 161776140 is about 12719.1249699026. The cubic root of 161776140 is about 544.8849629545.

The spelling of 161776140 in words is "one hundred sixty-one million, seven hundred seventy-six thousand, one hundred forty".