42787766 has 16 divisors (see below), whose sum is σ = 74912256. Its totient is φ = 17947176.

The previous prime is 42787763. The next prime is 42787777. The reversal of 42787766 is 66778724.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a self number, because there is not a number n which added to its sum of digits gives 42787766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42787763) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 31856 + ... + 33171.

It is an arithmetic number, because the mean of its divisors is an integer number (4682016).

Almost surely, 2^42787766 is an apocalyptic number.

42787766 is a deficient number, since it is larger than the sum of its proper divisors (32124490).

42787766 is a wasteful number, since it uses less digits than its factorization.

42787766 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65083.

The product of its digits is 790272, while the sum is 47.

The square root of 42787766 is about 6541.2358159602. The cubic root of 42787766 is about 349.7624674029.

The spelling of 42787766 in words is "forty-two million, seven hundred eighty-seven thousand, seven hundred sixty-six".