106643978 has 8 divisors (see below), whose sum is σ = 182818272. Its totient is φ = 45704556.

The previous prime is 106643909. The next prime is 106643989. The reversal of 106643978 is 879346601.

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

It is a super-2 number, since 2×106643978² = 22745876087328968, which contains 22 as substring.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3808700 + ... + 3808727.

It is an arithmetic number, because the mean of its divisors is an integer number (22852284).

Almost surely, 2^106643978 is an apocalyptic number.

106643978 is a deficient number, since it is larger than the sum of its proper divisors (76174294).

106643978 is an equidigital number, since it uses as much as digits as its factorization.

106643978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7617436.

The product of its (nonzero) digits is 217728, while the sum is 44.

The square root of 106643978 is about 10326.8571211187. The cubic root of 106643978 is about 474.2188127282.

The spelling of 106643978 in words is "one hundred six million, six hundred forty-three thousand, nine hundred seventy-eight".