105491778 has 16 divisors (see below), whose sum is σ = 241124160. Its totient is φ = 30140496.

The previous prime is 105491761. The next prime is 105491779. The reversal of 105491778 is 877194501.

It is a super-2 number, since 2×105491778² = 22257030451202568, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42), and also a Moran number because the ratio is a prime number: 2511709 = 105491778 / (1 + 0 + 5 + 4 + 9 + 1 + 7 + 7 + 8).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (105491779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1255813 + ... + 1255896.

It is an arithmetic number, because the mean of its divisors is an integer number (15070260).

Almost surely, 2^105491778 is an apocalyptic number.

105491778 is an abundant number, since it is smaller than the sum of its proper divisors (135632382).

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

105491778 is a wasteful number, since it uses less digits than its factorization.

105491778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2511721.

The product of its (nonzero) digits is 70560, while the sum is 42.

The square root of 105491778 is about 10270.9190435910. The cubic root of 105491778 is about 472.5047775335.

The spelling of 105491778 in words is "one hundred five million, four hundred ninety-one thousand, seven hundred seventy-eight".