163770 has 32 divisors (see below), whose sum is σ = 404352. Its totient is φ = 42432.

The previous prime is 163753. The next prime is 163771. The reversal of 163770 is 77361.

It is a super-2 number, since 2×163770² = 53641225800, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 163770.

It is not an unprimeable number, because it can be changed into a prime (163771) by changing a digit.

163770 is an untouchable number, because it is not equal to the sum of proper divisors of any 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, 1539 + ... + 1641.

It is an arithmetic number, because the mean of its divisors is an integer number (12636).

2¹⁶³⁷⁷⁰ is an apocalyptic number.

163770 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 163770, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (202176).

163770 is an abundant number, since it is smaller than the sum of its proper divisors (240582).

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

163770 is a wasteful number, since it uses less digits than its factorization.

163770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 166.

The product of its (nonzero) digits is 882, while the sum is 24.

The square root of 163770 is about 404.6850627340. The cubic root of 163770 is about 54.7114363244.

The spelling of 163770 in words is "one hundred sixty-three thousand, seven hundred seventy".