42742478 has 4 divisors (see below), whose sum is σ = 64113720. Its totient is φ = 21371238.

The previous prime is 42742477. The next prime is 42742489. The reversal of 42742478 is 87424724.

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

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42742477) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10685618 + ... + 10685621.

It is an arithmetic number, because the mean of its divisors is an integer number (16028430).

Almost surely, 2^42742478 is an apocalyptic number.

42742478 is a deficient number, since it is larger than the sum of its proper divisors (21371242).

42742478 is a wasteful number, since it uses less digits than its factorization.

42742478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21371241.

The product of its digits is 100352, while the sum is 38.

The square root of 42742478 is about 6537.7731682890. The cubic root of 42742478 is about 349.6390237496.

The spelling of 42742478 in words is "forty-two million, seven hundred forty-two thousand, four hundred seventy-eight".