4278020685 has 16 divisors (see below), whose sum is σ = 6946996416. Its totient is φ = 2247556608.

The previous prime is 4278020651. The next prime is 4278020693. The reversal of 4278020685 is 5860208724.

It is a happy number.

It is not a de Polignac number, because 4278020685 - 2²⁰ = 4276972109 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2127364 + ... + 2129373.

It is an arithmetic number, because the mean of its divisors is an integer number (434187276).

Almost surely, 2^4278020685 is an apocalyptic number.

It is an amenable number.

4278020685 is a deficient number, since it is larger than the sum of its proper divisors (2668975731).

4278020685 is a wasteful number, since it uses less digits than its factorization.

4278020685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4256812.

The product of its (nonzero) digits is 215040, while the sum is 42.

The square root of 4278020685 is about 65406.5798295554. The cubic root of 4278020685 is about 1623.3579543855.

The spelling of 4278020685 in words is "four billion, two hundred seventy-eight million, twenty thousand, six hundred eighty-five".