42787878 has 64 divisors (see below), whose sum is σ = 105753600. Its totient is φ = 11496576.

The previous prime is 42787853. The next prime is 42787891. The reversal of 42787878 is 87878724.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 42787878.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34375 + ... + 35597.

It is an arithmetic number, because the mean of its divisors is an integer number (1652400).

Almost surely, 2^42787878 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42787878, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52876800).

42787878 is an abundant number, since it is smaller than the sum of its proper divisors (62965722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

42787878 is a wasteful number, since it uses less digits than its factorization.

42787878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1266 (or 1252 counting only the distinct ones).

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

The square root of 42787878 is about 6541.2443770280. The cubic root of 42787878 is about 349.7627725787.

The spelling of 42787878 in words is "forty-two million, seven hundred eighty-seven thousand, eight hundred seventy-eight".