105720666 has 8 divisors (see below), whose sum is σ = 211441344. Its totient is φ = 35240220.

The previous prime is 105720661. The next prime is 105720677. The reversal of 105720666 is 666027501.

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

105720666 is an admirable number.

It is a super-2 number, since 2×105720666² = 22353718438967112, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (105720661) 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, 8810050 + ... + 8810061.

It is an arithmetic number, because the mean of its divisors is an integer number (26430168).

Almost surely, 2^105720666 is an apocalyptic number.

105720666 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

105720666 is a wasteful number, since it uses less digits than its factorization.

105720666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17620116.

The product of its (nonzero) digits is 15120, while the sum is 33.

The square root of 105720666 is about 10282.0555337928. The cubic root of 105720666 is about 472.8462655960.

The spelling of 105720666 in words is "one hundred five million, seven hundred twenty thousand, six hundred sixty-six".