163720 has 16 divisors (see below), whose sum is σ = 368460. Its totient is φ = 65472.

The previous prime is 163697. The next prime is 163729. The reversal of 163720 is 27361.

It can be written as a sum of positive squares in 2 ways, for example, as 161604 + 2116 = 402^2 + 46^2 .

It is a plaindrome in base 15.

It is not an unprimeable number, because it can be changed into a prime (163729) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2007 + ... + 2086.

2¹⁶³⁷²⁰ is an apocalyptic number.

163720 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163720 is an abundant number, since it is smaller than the sum of its proper divisors (204740).

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

163720 is a wasteful number, since it uses less digits than its factorization.

163720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4104 (or 4100 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 163720 is about 404.6232815842. The cubic root of 163720 is about 54.7058678437.

The spelling of 163720 in words is "one hundred sixty-three thousand, seven hundred twenty".