42778627 has 2 divisors, whose sum is σ = 42778628. Its totient is φ = 42778626.

The previous prime is 42778609. The next prime is 42778663. The reversal of 42778627 is 72687724.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 42778627 - 2¹⁹ = 42254339 is a prime.

It is not a weakly prime, because it can be changed into another prime (42778607) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21389313 + 21389314.

It is an arithmetic number, because the mean of its divisors is an integer number (21389314).

Almost surely, 2^42778627 is an apocalyptic number.

42778627 is a deficient number, since it is larger than the sum of its proper divisors (1).

42778627 is an equidigital number, since it uses as much as digits as its factorization.

42778627 is an evil number, because the sum of its binary digits is even.

The product of its digits is 263424, while the sum is 43.

The square root of 42778627 is about 6540.5372103521. The cubic root of 42778627 is about 349.7375638141.

The spelling of 42778627 in words is "forty-two million, seven hundred seventy-eight thousand, six hundred twenty-seven".