2878145685 has 48 divisors (see below), whose sum is σ = 5052653424. Its totient is φ = 1515442176.

The previous prime is 2878145653. The next prime is 2878145689. The reversal of 2878145685 is 5865418782.

2878145685 is a `hidden beast` number, since 2 + 8 + 78 + 1 + 4 + 568 + 5 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 1007237169 + 1870908516 = 31737^2 + 43254^2 .

It is not a de Polignac number, because 2878145685 - 2⁵ = 2878145653 is a prime.

It is a super-3 number, since 3×2878145685³ (a number of 29 digits) contains 333 as substring.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2878145689) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3373719 + ... + 3374571.

It is an arithmetic number, because the mean of its divisors is an integer number (105263613).

Almost surely, 2^2878145685 is an apocalyptic number.

It is an amenable number.

2878145685 is a deficient number, since it is larger than the sum of its proper divisors (2174507739).

2878145685 is a wasteful number, since it uses less digits than its factorization.

2878145685 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1734 (or 1731 counting only the distinct ones).

The product of its digits is 4300800, while the sum is 54.

The square root of 2878145685 is about 53648.3521182152. The cubic root of 2878145685 is about 1422.4519043580.

The spelling of 2878145685 in words is "two billion, eight hundred seventy-eight million, one hundred forty-five thousand, six hundred eighty-five".