168653890 has 8 divisors (see below), whose sum is σ = 303577020. Its totient is φ = 67461552.

The previous prime is 168653887. The next prime is 168653909. The reversal of 168653890 is 98356861.

It can be written as a sum of positive squares in 2 ways, for example, as 163098441 + 5555449 = 12771^2 + 2357^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×168653890² = 56888269224264200, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 168653890.

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 3 ways as a sum of consecutive naturals, for example, 8432685 + ... + 8432704.

Almost surely, 2^168653890 is an apocalyptic number.

168653890 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

168653890 is a deficient number, since it is larger than the sum of its proper divisors (134923130).

168653890 is a wasteful number, since it uses less digits than its factorization.

168653890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16865396.

The product of its (nonzero) digits is 311040, while the sum is 46.

The square root of 168653890 is about 12986.6812542697. The cubic root of 168653890 is about 552.4997945714.

The spelling of 168653890 in words is "one hundred sixty-eight million, six hundred fifty-three thousand, eight hundred ninety".