168820785 has 24 divisors (see below), whose sum is σ = 334426560. Its totient is φ = 77175072.

The previous prime is 168820783. The next prime is 168820789. The reversal of 168820785 is 587028861.

It is not a de Polignac number, because 168820785 - 2¹ = 168820783 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 168820785.

It is not an unprimeable number, because it can be changed into a prime (168820781) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 267655 + ... + 268284.

It is an arithmetic number, because the mean of its divisors is an integer number (13934440).

Almost surely, 2^168820785 is an apocalyptic number.

168820785 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

168820785 is a deficient number, since it is larger than the sum of its proper divisors (165605775).

168820785 is a wasteful number, since it uses less digits than its factorization.

168820785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 535957 (or 535954 counting only the distinct ones).

The product of its (nonzero) digits is 215040, while the sum is 45.

The square root of 168820785 is about 12993.1052870359. The cubic root of 168820785 is about 552.6819804156.

168820785 divided by its sum of digits (45) gives a palindrome (3751573).

The spelling of 168820785 in words is "one hundred sixty-eight million, eight hundred twenty thousand, seven hundred eighty-five".