106815778 has 4 divisors (see below), whose sum is σ = 160223670. Its totient is φ = 53407888.

The previous prime is 106815773. The next prime is 106815809. The reversal of 106815778 is 877518601.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 103693489 + 3122289 = 10183^2 + 1767^2 .

It is a super-2 number, since 2×106815778² = 22819220859490568, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (106815773) 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 as a sum of consecutive naturals, namely, 26703943 + ... + 26703946.

Almost surely, 2^106815778 is an apocalyptic number.

106815778 is a deficient number, since it is larger than the sum of its proper divisors (53407892).

106815778 is an equidigital number, since it uses as much as digits as its factorization.

106815778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53407891.

The product of its (nonzero) digits is 94080, while the sum is 43.

The square root of 106815778 is about 10335.1718902010. The cubic root of 106815778 is about 474.4733264968.

The spelling of 106815778 in words is "one hundred six million, eight hundred fifteen thousand, seven hundred seventy-eight".