4778145 has 12 divisors (see below), whose sum is σ = 8282196. Its totient is φ = 2548320.

The previous prime is 4778129. The next prime is 4778153. The reversal of 4778145 is 5418774.

It can be written as a sum of positive squares in 2 ways, for example, as 762129 + 4016016 = 873^2 + 2004^2 .

It is not a de Polignac number, because 4778145 - 2⁴ = 4778129 is a prime.

It is a Curzon number.

4778145 is a lucky number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 53046 + ... + 53135.

It is an arithmetic number, because the mean of its divisors is an integer number (690183).

Almost surely, 2^4778145 is an apocalyptic number.

4778145 is a gapful number since it is divisible by the number (45) formed by its first and last digit.

It is an amenable number.

4778145 is a deficient number, since it is larger than the sum of its proper divisors (3504051).

4778145 is a wasteful number, since it uses less digits than its factorization.

4778145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106192 (or 106189 counting only the distinct ones).

The product of its digits is 31360, while the sum is 36.

The square root of 4778145 is about 2185.8968411158. The cubic root of 4778145 is about 168.4301265585.

The spelling of 4778145 in words is "four million, seven hundred seventy-eight thousand, one hundred forty-five".