161638224 has 40 divisors (see below), whose sum is σ = 455527392. Its totient is φ = 48981120.

The previous prime is 161638219. The next prime is 161638231. The reversal of 161638224 is 422836161.

161638224 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×161638224² = 52253830915748352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 152539 + ... + 153594.

Almost surely, 2^161638224 is an apocalyptic number.

It is an amenable number.

161638224 is an abundant number, since it is smaller than the sum of its proper divisors (293889168).

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

161638224 is a wasteful number, since it uses less digits than its factorization.

161638224 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306155 (or 306149 counting only the distinct ones).

The product of its digits is 13824, while the sum is 33.

The square root of 161638224 is about 12713.7022145400. The cubic root of 161638224 is about 544.7300787225.

The spelling of 161638224 in words is "one hundred sixty-one million, six hundred thirty-eight thousand, two hundred twenty-four".