163645320 has 64 divisors (see below), whose sum is σ = 491829120. Its totient is φ = 43559424.

The previous prime is 163645303. The next prime is 163645337. The reversal of 163645320 is 23546361.

It is an interprime number because it is at equal distance from previous prime (163645303) and next prime (163645337).

It is a Harshad number since it is a multiple of its sum of digits (30).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 97932 + ... + 99588.

It is an arithmetic number, because the mean of its divisors is an integer number (7684830).

Almost surely, 2^163645320 is an apocalyptic number.

163645320 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163645320 is an abundant number, since it is smaller than the sum of its proper divisors (328183800).

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

163645320 is a wasteful number, since it uses less digits than its factorization.

163645320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2494 (or 2490 counting only the distinct ones).

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 163645320 is about 12792.3930521228. The cubic root of 163645320 is about 546.9754864926.

The spelling of 163645320 in words is "one hundred sixty-three million, six hundred forty-five thousand, three hundred twenty".