163243640 has 32 divisors (see below), whose sum is σ = 419770080. Its totient is φ = 55969152.

The previous prime is 163243631. The next prime is 163243651. The reversal of 163243640 is 46342361.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 291227 + ... + 291786.

It is an arithmetic number, because the mean of its divisors is an integer number (13117815).

Almost surely, 2^163243640 is an apocalyptic number.

163243640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

163243640 is an abundant number, since it is smaller than the sum of its proper divisors (256526440).

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

163243640 is a wasteful number, since it uses less digits than its factorization.

163243640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 583031 (or 583027 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 29.

The square root of 163243640 is about 12776.6834507238. The cubic root of 163243640 is about 546.5275887195.

The spelling of 163243640 in words is "one hundred sixty-three million, two hundred forty-three thousand, six hundred forty".