42182778 has 48 divisors (see below), whose sum is σ = 93844800. Its totient is φ = 12629760.

The previous prime is 42182773. The next prime is 42182779. The reversal of 42182778 is 87728124.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42182773) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 70123 + ... + 70721.

It is an arithmetic number, because the mean of its divisors is an integer number (1955100).

Almost surely, 2^42182778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42182778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46922400).

42182778 is an abundant number, since it is smaller than the sum of its proper divisors (51662022).

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

42182778 is a wasteful number, since it uses less digits than its factorization.

42182778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 723 (or 712 counting only the distinct ones).

The product of its digits is 50176, while the sum is 39.

The square root of 42182778 is about 6494.8270184817. The cubic root of 42182778 is about 348.1061738393.

It can be divided in two parts, 4218 and 2778, that added together give a palindrome (6996).

The spelling of 42182778 in words is "forty-two million, one hundred eighty-two thousand, seven hundred seventy-eight".