168457978 has 8 divisors (see below), whose sum is σ = 272124468. Its totient is φ = 77749824.

The previous prime is 168457963. The next prime is 168457979. The reversal of 168457978 is 879754861.

It can be written as a sum of positive squares in 2 ways, for example, as 168039369 + 418609 = 12963^2 + 647^2 .

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

It is not an unprimeable number, because it can be changed into a prime (168457979) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3239551 + ... + 3239602.

Almost surely, 2^168457978 is an apocalyptic number.

168457978 is a deficient number, since it is larger than the sum of its proper divisors (103666490).

168457978 is a wasteful number, since it uses less digits than its factorization.

168457978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6479168.

The product of its digits is 3386880, while the sum is 55.

The square root of 168457978 is about 12979.1362578563. The cubic root of 168457978 is about 552.2857797852.

The spelling of 168457978 in words is "one hundred sixty-eight million, four hundred fifty-seven thousand, nine hundred seventy-eight".