42778484 has 12 divisors (see below), whose sum is σ = 85557024. Its totient is φ = 18333624.

The previous prime is 42778469. The next prime is 42778487. The reversal of 42778484 is 48487724.

42778484 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42778487) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 763874 + ... + 763929.

It is an arithmetic number, because the mean of its divisors is an integer number (7129752).

Almost surely, 2^42778484 is an apocalyptic number.

It is an amenable number.

42778484 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

42778484 is a wasteful number, since it uses less digits than its factorization.

42778484 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527814 (or 1527812 counting only the distinct ones).

The product of its digits is 401408, while the sum is 44.

The square root of 42778484 is about 6540.5262785192. The cubic root of 42778484 is about 349.7371741138.

The spelling of 42778484 in words is "forty-two million, seven hundred seventy-eight thousand, four hundred eighty-four".