42781004 has 12 divisors (see below), whose sum is σ = 85562064. Its totient is φ = 18334704.

The previous prime is 42780973. The next prime is 42781007. The reversal of 42781004 is 40018724.

42781004 is an admirable number.

It is a zygodrome in base 3.

It is not an unprimeable number, because it can be changed into a prime (42781007) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 763919 + ... + 763974.

It is an arithmetic number, because the mean of its divisors is an integer number (7130172).

Almost surely, 2^42781004 is an apocalyptic number.

It is an amenable number.

42781004 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.

42781004 is a wasteful number, since it uses less digits than its factorization.

42781004 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527904 (or 1527902 counting only the distinct ones).

The product of its (nonzero) digits is 1792, while the sum is 26.

The square root of 42781004 is about 6540.7189207304. The cubic root of 42781004 is about 349.7440414319.

Adding to 42781004 its reverse (40018724), we get a palindrome (82799728).

The spelling of 42781004 in words is "forty-two million, seven hundred eighty-one thousand, four".