168978215 has 48 divisors (see below), whose sum is σ = 258552000. Its totient is φ = 105219072.

The previous prime is 168978197. The next prime is 168978233. The reversal of 168978215 is 512879861.

It is an interprime number because it is at equal distance from previous prime (168978197) and next prime (168978233).

It is not a de Polignac number, because 168978215 - 2⁸ = 168977959 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 168978215.

It is a congruent number.

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 47 ways as a sum of consecutive naturals, for example, 120086 + ... + 121484.

It is an arithmetic number, because the mean of its divisors is an integer number (5386500).

Almost surely, 2^168978215 is an apocalyptic number.

168978215 is a deficient number, since it is larger than the sum of its proper divisors (89573785).

168978215 is a wasteful number, since it uses less digits than its factorization.

168978215 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1464 (or 1457 counting only the distinct ones).

The product of its digits is 241920, while the sum is 47.

The square root of 168978215 is about 12999.1620883809. The cubic root of 168978215 is about 552.8537240632.

The spelling of 168978215 in words is "one hundred sixty-eight million, nine hundred seventy-eight thousand, two hundred fifteen".