42178778 has 16 divisors (see below), whose sum is σ = 65435040. Its totient is φ = 20379216.

The previous prime is 42178769. The next prime is 42178813. The reversal of 42178778 is 87787124.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4133 + ... + 10071.

It is an arithmetic number, because the mean of its divisors is an integer number (4089690).

Almost surely, 2^42178778 is an apocalyptic number.

42178778 is a deficient number, since it is larger than the sum of its proper divisors (23256262).

42178778 is a wasteful number, since it uses less digits than its factorization.

42178778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6061.

The product of its digits is 175616, while the sum is 44.

The square root of 42178778 is about 6494.5190738037. The cubic root of 42178778 is about 348.0951703858.

The spelling of 42178778 in words is "forty-two million, one hundred seventy-eight thousand, seven hundred seventy-eight".