42778851 has 16 divisors (see below), whose sum is σ = 61801344. Its totient is φ = 26216064.

The previous prime is 42778847. The next prime is 42778859. The reversal of 42778851 is 15887724.

It is not a de Polignac number, because 42778851 - 2² = 42778847 is a prime.

It is not an unprimeable number, because it can be changed into a prime (42778859) by changing a digit.

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 in 15 ways as a sum of consecutive naturals, for example, 7561 + ... + 11946.

It is an arithmetic number, because the mean of its divisors is an integer number (3862584).

Almost surely, 2^42778851 is an apocalyptic number.

42778851 is a deficient number, since it is larger than the sum of its proper divisors (19022493).

42778851 is a wasteful number, since it uses less digits than its factorization.

42778851 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19570.

The product of its digits is 125440, while the sum is 42.

The square root of 42778851 is about 6540.5543343053. The cubic root of 42778851 is about 349.7381742519.

The spelling of 42778851 in words is "forty-two million, seven hundred seventy-eight thousand, eight hundred fifty-one".