163640688 has 40 divisors (see below), whose sum is σ = 423294336. Its totient is φ = 54475200.

The previous prime is 163640641. The next prime is 163640693. The reversal of 163640688 is 886046361.

It is a happy number.

163640688 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×163640688² = 53556549538226688, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 44853 + ... + 48363.

Almost surely, 2^163640688 is an apocalyptic number.

It is an amenable number.

163640688 is an abundant number, since it is smaller than the sum of its proper divisors (259653648).

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

163640688 is a wasteful number, since it uses less digits than its factorization.

163640688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4493 (or 4487 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 42.

The square root of 163640688 is about 12792.2120057479. The cubic root of 163640688 is about 546.9703257088.

It can be divided in two parts, 1636 and 40688, that added together give a palindrome (42324).

The spelling of 163640688 in words is "one hundred sixty-three million, six hundred forty thousand, six hundred eighty-eight".