42788779 has 16 divisors (see below), whose sum is σ = 52030080. Its totient is φ = 34680960.

The previous prime is 42788771. The next prime is 42788791. The reversal of 42788779 is 97788724.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 42788779 - 2³ = 42788771 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (42788771) 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, 2469 + ... + 9574.

It is an arithmetic number, because the mean of its divisors is an integer number (3251880).

Almost surely, 2^42788779 is an apocalyptic number.

42788779 is a deficient number, since it is larger than the sum of its proper divisors (9241301).

42788779 is a wasteful number, since it uses less digits than its factorization.

42788779 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12090.

The product of its digits is 1580544, while the sum is 52.

The square root of 42788779 is about 6541.3132473533. The cubic root of 42788779 is about 349.7652275890.

Subtracting 42788779 from its reverse (97788724), we obtain a palindrome (54999945).

The spelling of 42788779 in words is "forty-two million, seven hundred eighty-eight thousand, seven hundred seventy-nine".