161872782 has 8 divisors (see below), whose sum is σ = 323745576. Its totient is φ = 53957592.

The previous prime is 161872771. The next prime is 161872847. The reversal of 161872782 is 287278161.

It is a sphenic number, since it is the product of 3 distinct primes.

161872782 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13489393 + ... + 13489404.

It is an arithmetic number, because the mean of its divisors is an integer number (40468197).

Almost surely, 2^161872782 is an apocalyptic number.

161872782 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

161872782 is a wasteful number, since it uses less digits than its factorization.

161872782 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26978802.

The product of its digits is 75264, while the sum is 42.

The square root of 161872782 is about 12722.9234847970. The cubic root of 161872782 is about 544.9934426728.

The spelling of 161872782 in words is "one hundred sixty-one million, eight hundred seventy-two thousand, seven hundred eighty-two".