42509678 has 4 divisors (see below), whose sum is σ = 63764520. Its totient is φ = 21254838.

The previous prime is 42509653. The next prime is 42509717. The reversal of 42509678 is 87690524.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10627418 + ... + 10627421.

It is an arithmetic number, because the mean of its divisors is an integer number (15941130).

Almost surely, 2^42509678 is an apocalyptic number.

42509678 is a deficient number, since it is larger than the sum of its proper divisors (21254842).

42509678 is a wasteful number, since it uses less digits than its factorization.

42509678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21254841.

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 42509678 is about 6519.9446316667. The cubic root of 42509678 is about 349.0030897119.

The spelling of 42509678 in words is "forty-two million, five hundred nine thousand, six hundred seventy-eight".