42178670 has 32 divisors (see below), whose sum is σ = 81038880. Its totient is φ = 15759360.

The previous prime is 42178663. The next prime is 42178699. The reversal of 42178670 is 7687124.

It is a happy number.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42178670.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 12350 + ... + 15390.

It is an arithmetic number, because the mean of its divisors is an integer number (2532465).

Almost surely, 2^42178670 is an apocalyptic number.

42178670 is a deficient number, since it is larger than the sum of its proper divisors (38860210).

42178670 is a wasteful number, since it uses less digits than its factorization.

42178670 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3140.

The product of its (nonzero) digits is 18816, while the sum is 35.

The square root of 42178670 is about 6494.5107590949. The cubic root of 42178670 is about 348.0948732829.

The spelling of 42178670 in words is "forty-two million, one hundred seventy-eight thousand, six hundred seventy".