163640484 has 72 divisors (see below), whose sum is σ = 476443968. Its totient is φ = 46388160.

The previous prime is 163640479. The next prime is 163640489. The reversal of 163640484 is 484046361.

163640484 is a `hidden beast` number, since 1 + 6 + 3 + 640 + 4 + 8 + 4 = 666.

163640484 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (163640479) and next prime (163640489).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (163640489) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 30534 + ... + 35490.

Almost surely, 2^163640484 is an apocalyptic number.

163640484 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 163640484, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (238221984).

163640484 is an abundant number, since it is smaller than the sum of its proper divisors (312803484).

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

163640484 is a wasteful number, since it uses less digits than its factorization.

163640484 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5105 (or 5100 counting only the distinct ones).

The product of its (nonzero) digits is 55296, while the sum is 36.

The square root of 163640484 is about 12792.2040321440. The cubic root of 163640484 is about 546.9700984182.

The spelling of 163640484 in words is "one hundred sixty-three million, six hundred forty thousand, four hundred eighty-four".