42978056 has 32 divisors (see below), whose sum is σ = 88404480. Its totient is φ = 19425600.

The previous prime is 42978049. The next prime is 42978083. The reversal of 42978056 is 65087924.

It is a super-2 number, since 2×42978056² = 3694226595078272, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15530 + ... + 18086.

It is an arithmetic number, because the mean of its divisors is an integer number (2762640).

Almost surely, 2^42978056 is an apocalyptic number.

It is an amenable number.

42978056 is an abundant number, since it is smaller than the sum of its proper divisors (45426424).

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

42978056 is a wasteful number, since it uses less digits than its factorization.

42978056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2765 (or 2761 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 41.

The square root of 42978056 is about 6555.7650964628. The cubic root of 42978056 is about 350.2802001096.

The spelling of 42978056 in words is "forty-two million, nine hundred seventy-eight thousand, fifty-six".