161766228 has 48 divisors (see below), whose sum is σ = 427891520. Its totient is φ = 47153664.

The previous prime is 161766211. The next prime is 161766251. The reversal of 161766228 is 822667161.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 24325 + ... + 30252.

Almost surely, 2^161766228 is an apocalyptic number.

It is an amenable number.

161766228 is an abundant number, since it is smaller than the sum of its proper divisors (266125292).

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

161766228 is a wasteful number, since it uses less digits than its factorization.

161766228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54616 (or 54614 counting only the distinct ones).

The product of its digits is 48384, while the sum is 39.

The square root of 161766228 is about 12718.7353144878. The cubic root of 161766228 is about 544.8738343871.

The spelling of 161766228 in words is "one hundred sixty-one million, seven hundred sixty-six thousand, two hundred twenty-eight".