4278135985 has 4 divisors (see below), whose sum is σ = 5133763188. Its totient is φ = 3422508784.

The previous prime is 4278135971. The next prime is 4278136039. The reversal of 4278135985 is 5895318724.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 823517809 + 3454618176 = 28697^2 + 58776^2 .

It is a cyclic number.

It is not a de Polignac number, because 4278135985 - 2¹³ = 4278127793 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 427813594 + ... + 427813603.

It is an arithmetic number, because the mean of its divisors is an integer number (1283440797).

Almost surely, 2^4278135985 is an apocalyptic number.

It is an amenable number.

4278135985 is a deficient number, since it is larger than the sum of its proper divisors (855627203).

4278135985 is an equidigital number, since it uses as much as digits as its factorization.

4278135985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 855627202.

The product of its digits is 2419200, while the sum is 52.

The square root of 4278135985 is about 65407.4612334098. The cubic root of 4278135985 is about 1623.3725383489.

The spelling of 4278135985 in words is "four billion, two hundred seventy-eight million, one hundred thirty-five thousand, nine hundred eighty-five".