42784681 has 9 divisors (see below), whose sum is σ = 44419869. Its totient is φ = 41208300.

The previous prime is 42784673. The next prime is 42784697. The reversal of 42784681 is 18648724.

The square root of 42784681 is 6541.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 42784681 - 2³ = 42784673 is a prime.

It is a super-2 number, since 2×42784681² = 3661057856543522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42784481) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 202666 + ... + 202876.

It is an arithmetic number, because the mean of its divisors is an integer number (4935541).

Almost surely, 2^42784681 is an apocalyptic number.

42784681 is the 6541-st square number.

42784681 is the 3271-st centered octagonal number.

It is an amenable number.

42784681 is a deficient number, since it is larger than the sum of its proper divisors (1635188).

42784681 is an frugal number, since it uses more digits than its factorization.

42784681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 242 counting only the distinct ones).

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

The cubic root of 42784681 is about 349.7540612373.

The spelling of 42784681 in words is "forty-two million, seven hundred eighty-four thousand, six hundred eighty-one".