42778771 has 16 divisors (see below), whose sum is σ = 50464000. Its totient is φ = 35497440.

The previous prime is 42778739. The next prime is 42778777. The reversal of 42778771 is 17787724.

It is a cyclic number.

It is not a de Polignac number, because 42778771 - 2⁵ = 42778739 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42778777) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 85480 + ... + 85978.

It is an arithmetic number, because the mean of its divisors is an integer number (3154000).

Almost surely, 2^42778771 is an apocalyptic number.

42778771 is a deficient number, since it is larger than the sum of its proper divisors (7685229).

42778771 is a wasteful number, since it uses less digits than its factorization.

42778771 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 874.

The product of its digits is 153664, while the sum is 43.

The square root of 42778771 is about 6540.5482186129. The cubic root of 42778771 is about 349.7379562387.

The spelling of 42778771 in words is "forty-two million, seven hundred seventy-eight thousand, seven hundred seventy-one".