163723690 has 16 divisors (see below), whose sum is σ = 317372328. Its totient is φ = 60451776.

The previous prime is 163723687. The next prime is 163723711. The reversal of 163723690 is 96327361.

It can be written as a sum of positive squares in 4 ways, for example, as 150626529 + 13097161 = 12273^2 + 3619^2 .

It is a super-2 number, since 2×163723690² = 53610893334432200, which contains 22 as substring.

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, 629577 + ... + 629836.

Almost surely, 2^163723690 is an apocalyptic number.

163723690 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

163723690 is a deficient number, since it is larger than the sum of its proper divisors (153648638).

163723690 is a wasteful number, since it uses less digits than its factorization.

163723690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1259433.

The product of its (nonzero) digits is 40824, while the sum is 37.

The square root of 163723690 is about 12795.4558340061. The cubic root of 163723690 is about 547.0627883634.

The spelling of 163723690 in words is "one hundred sixty-three million, seven hundred twenty-three thousand, six hundred ninety".