163644026 has 24 divisors (see below), whose sum is σ = 307509300. Its totient is φ = 64737792.

The previous prime is 163643999. The next prime is 163644037. The reversal of 163644026 is 620446361.

It can be written as a sum of positive squares in 2 ways, for example, as 157879225 + 5764801 = 12565^2 + 2401^2 .

It is a junction number, because it is equal to n+sod(n) for n = 163643983 and 163644001.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62951 + ... + 65498.

Almost surely, 2^163644026 is an apocalyptic number.

163644026 is a deficient number, since it is larger than the sum of its proper divisors (143865274).

163644026 is a wasteful number, since it uses less digits than its factorization.

163644026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 128478 (or 128471 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 32.

The square root of 163644026 is about 12792.3424750903. The cubic root of 163644026 is about 546.9740447809.

The spelling of 163644026 in words is "one hundred sixty-three million, six hundred forty-four thousand, twenty-six".