168780240 has 80 divisors (see below), whose sum is σ = 581361600. Its totient is φ = 45007488.

The previous prime is 168780221. The next prime is 168780259. The reversal of 168780240 is 42087861.

It is an interprime number because it is at equal distance from previous prime (168780221) and next prime (168780259).

It is a tau number, because it is divible by the number of its divisors (80).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 168780195 and 168780204.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 36910 + ... + 41229.

It is an arithmetic number, because the mean of its divisors is an integer number (7267020).

Almost surely, 2^168780240 is an apocalyptic number.

168780240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

168780240 is an abundant number, since it is smaller than the sum of its proper divisors (412581360).

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

168780240 is a wasteful number, since it uses less digits than its factorization.

168780240 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78161 (or 78149 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 168780240 is about 12991.5449427695. The cubic root of 168780240 is about 552.6377317467.

The spelling of 168780240 in words is "one hundred sixty-eight million, seven hundred eighty thousand, two hundred forty".