42978081 has 16 divisors (see below), whose sum is σ = 58451904. Its totient is φ = 28084224.

The previous prime is 42978049. The next prime is 42978083. The reversal of 42978081 is 18087924.

42978081 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 42978081 - 2⁵ = 42978049 is a prime.

It is a super-2 number, since 2×42978081² = 3694230892885122, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (42978083) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 32230 + ... + 33536.

It is an arithmetic number, because the mean of its divisors is an integer number (3653244).

Almost surely, 2^42978081 is an apocalyptic number.

It is an amenable number.

42978081 is a deficient number, since it is larger than the sum of its proper divisors (15473823).

42978081 is a wasteful number, since it uses less digits than its factorization.

42978081 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1520.

The product of its (nonzero) digits is 32256, while the sum is 39.

The square root of 42978081 is about 6555.7670031812. The cubic root of 42978081 is about 350.2802680281.

The spelling of 42978081 in words is "forty-two million, nine hundred seventy-eight thousand, eighty-one".