42777878 has 32 divisors (see below), whose sum is σ = 75775392. Its totient is φ = 17856000.

The previous prime is 42777877. The next prime is 42777881. The reversal of 42777878 is 87877724.

42777878 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42777877) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 106478 + ... + 106878.

It is an arithmetic number, because the mean of its divisors is an integer number (2367981).

Almost surely, 2^42777878 is an apocalyptic number.

42777878 is a deficient number, since it is larger than the sum of its proper divisors (32997514).

42777878 is a wasteful number, since it uses less digits than its factorization.

42777878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 800.

The product of its digits is 1229312, while the sum is 50.

The square root of 42777878 is about 6540.4799518078. The cubic root of 42777878 is about 349.7355226471.

The spelling of 42777878 in words is "forty-two million, seven hundred seventy-seven thousand, eight hundred seventy-eight".