42778887 has 16 divisors (see below), whose sum is σ = 58007040. Its totient is φ = 28039392.

The previous prime is 42778877. The next prime is 42778891. The reversal of 42778887 is 78887724.

It is not a de Polignac number, because 42778887 - 2¹⁰ = 42777863 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42778847) 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, 51189 + ... + 52017.

It is an arithmetic number, because the mean of its divisors is an integer number (3625440).

Almost surely, 2^42778887 is an apocalyptic number.

42778887 is a deficient number, since it is larger than the sum of its proper divisors (15228153).

42778887 is a wasteful number, since it uses less digits than its factorization.

42778887 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1102.

The product of its digits is 1404928, while the sum is 51.

The square root of 42778887 is about 6540.5570863650. The cubic root of 42778887 is about 349.7382723578.

The spelling of 42778887 in words is "forty-two million, seven hundred seventy-eight thousand, eight hundred eighty-seven".