42578125 has 18 divisors (see below), whose sum is σ = 53710910. Its totient is φ = 33750000.

The previous prime is 42578113. The next prime is 42578143. The reversal of 42578125 is 52187524.

It is a happy number.

It can be written as a sum of positive squares in 9 ways, for example, as 18164644 + 24413481 = 4262^2 + 4941^2 .

It is not a de Polignac number, because 42578125 - 2¹¹ = 42576077 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 390571 + ... + 390679.

Almost surely, 2^42578125 is an apocalyptic number.

It is an amenable number.

42578125 is a deficient number, since it is larger than the sum of its proper divisors (11132785).

42578125 is an frugal number, since it uses more digits than its factorization.

42578125 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 114 counting only the distinct ones).

The product of its digits is 22400, while the sum is 34.

The square root of 42578125 is about 6525.1915680691. The cubic root of 42578125 is about 349.1903051560.

The spelling of 42578125 in words is "forty-two million, five hundred seventy-eight thousand, one hundred twenty-five".