163643490 has 48 divisors (see below), whose sum is σ = 441237888. Its totient is φ = 43637616.

The previous prime is 163643477. The next prime is 163643503. The reversal of 163643490 is 94346361.

163643490 is a `hidden beast` number, since 1 + 6 + 3 + 643 + 4 + 9 + 0 = 666.

It is an interprime number because it is at equal distance from previous prime (163643477) and next prime (163643503).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31242 + ... + 36101.

It is an arithmetic number, because the mean of its divisors is an integer number (9192456).

Almost surely, 2^163643490 is an apocalyptic number.

163643490 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

163643490 is an abundant number, since it is smaller than the sum of its proper divisors (277594398).

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

163643490 is an equidigital number, since it uses as much as digits as its factorization.

163643490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67365 (or 67353 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 163643490 is about 12792.3215250399. The cubic root of 163643490 is about 546.9734475936.

The spelling of 163643490 in words is "one hundred sixty-three million, six hundred forty-three thousand, four hundred ninety".