42878646 has 40 divisors (see below), whose sum is σ = 99403920. Its totient is φ = 13798512.

The previous prime is 42878639. The next prime is 42878653. The reversal of 42878646 is 64687824.

42878646 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (42878639) and next prime (42878653).

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 135 + ... + 9261.

It is an arithmetic number, because the mean of its divisors is an integer number (2485098).

Almost surely, 2^42878646 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42878646, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (49701960).

42878646 is an abundant number, since it is smaller than the sum of its proper divisors (56525274).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42878646 is a wasteful number, since it uses less digits than its factorization.

42878646 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9170 (or 9161 counting only the distinct ones).

The product of its digits is 516096, while the sum is 45.

The square root of 42878646 is about 6548.1788307895. The cubic root of 42878646 is about 350.0099208072.

The spelling of 42878646 in words is "forty-two million, eight hundred seventy-eight thousand, six hundred forty-six".