42778718 has 4 divisors (see below), whose sum is σ = 64168080. Its totient is φ = 21389358.

The previous prime is 42778699. The next prime is 42778739. The reversal of 42778718 is 81787724.

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 pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10694678 + ... + 10694681.

It is an arithmetic number, because the mean of its divisors is an integer number (16042020).

Almost surely, 2^42778718 is an apocalyptic number.

42778718 is a deficient number, since it is larger than the sum of its proper divisors (21389362).

42778718 is a wasteful number, since it uses less digits than its factorization.

42778718 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21389361.

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

The square root of 42778718 is about 6540.5441669635. The cubic root of 42778718 is about 349.7378118047.

The spelling of 42778718 in words is "forty-two million, seven hundred seventy-eight thousand, seven hundred eighteen".