42781648 has 40 divisors (see below), whose sum is σ = 102021248. Its totient is φ = 16924032.

The previous prime is 42781637. The next prime is 42781649. The reversal of 42781648 is 84618724.

It is a self number, because there is not a number n which added to its sum of digits gives 42781648.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (42781649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13236 + ... + 16147.

Almost surely, 2^42781648 is an apocalyptic number.

It is an amenable number.

42781648 is an abundant number, since it is smaller than the sum of its proper divisors (59239600).

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

42781648 is a wasteful number, since it uses less digits than its factorization.

42781648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29411 (or 29405 counting only the distinct ones).

The product of its digits is 86016, while the sum is 40.

The square root of 42781648 is about 6540.7681506074. The cubic root of 42781648 is about 349.7457963700.

The spelling of 42781648 in words is "forty-two million, seven hundred eighty-one thousand, six hundred forty-eight".