42781380 has 96 divisors (see below), whose sum is σ = 129427200. Its totient is φ = 10526208.

The previous prime is 42781337. The next prime is 42781391. The reversal of 42781380 is 8318724.

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, 39486 + ... + 40554.

It is an arithmetic number, because the mean of its divisors is an integer number (1348200).

Almost surely, 2^42781380 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 42781380, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64713600).

42781380 is an abundant number, since it is smaller than the sum of its proper divisors (86645820).

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

42781380 is a wasteful number, since it uses less digits than its factorization.

42781380 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1133 (or 1131 counting only the distinct ones).

The product of its (nonzero) digits is 10752, while the sum is 33.

The square root of 42781380 is about 6540.7476636849. The cubic root of 42781380 is about 349.7450660563.

The spelling of 42781380 in words is "forty-two million, seven hundred eighty-one thousand, three hundred eighty".