42878642 has 8 divisors (see below), whose sum is σ = 66392832. Its totient is φ = 20747700.

The previous prime is 42878639. The next prime is 42878653. The reversal of 42878642 is 24687824.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a self number, because there is not a number n which added to its sum of digits gives 42878642.

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, 345734 + ... + 345857.

It is an arithmetic number, because the mean of its divisors is an integer number (8299104).

Almost surely, 2^42878642 is an apocalyptic number.

42878642 is a deficient number, since it is larger than the sum of its proper divisors (23514190).

42878642 is a wasteful number, since it uses less digits than its factorization.

42878642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 691624.

The product of its digits is 172032, while the sum is 41.

The square root of 42878642 is about 6548.1785253611. The cubic root of 42878642 is about 350.0099099235.

The spelling of 42878642 in words is "forty-two million, eight hundred seventy-eight thousand, six hundred forty-two".