168508840 has 32 divisors (see below), whose sum is σ = 385365960. Its totient is φ = 66297600.

The previous prime is 168508831. The next prime is 168508849. The reversal of 168508840 is 48805861.

It is an interprime number because it is at equal distance from previous prime (168508831) and next prime (168508849).

It can be written as a sum of positive squares in 4 ways, for example, as 100841764 + 67667076 = 10042^2 + 8226^2 .

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 168508793 and 168508802.

It is not an unprimeable number, because it can be changed into a prime (168508849) by changing a digit.

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, 32091 + ... + 36970.

Almost surely, 2^168508840 is an apocalyptic number.

168508840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168508840 is an abundant number, since it is smaller than the sum of its proper divisors (216857120).

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

168508840 is a wasteful number, since it uses less digits than its factorization.

168508840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 69133 (or 69129 counting only the distinct ones).

The product of its (nonzero) digits is 61440, while the sum is 40.

The square root of 168508840 is about 12981.0954853587. The cubic root of 168508840 is about 552.3413575086.

The spelling of 168508840 in words is "one hundred sixty-eight million, five hundred eight thousand, eight hundred forty".