42978816 has 80 divisors (see below), whose sum is σ = 127261200. Its totient is φ = 14321664.

The previous prime is 42978799. The next prime is 42978829. The reversal of 42978816 is 61887924.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 12270 + ... + 15378.

It is an arithmetic number, because the mean of its divisors is an integer number (1590765).

Almost surely, 2^42978816 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 42978816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (63630600).

42978816 is an abundant number, since it is smaller than the sum of its proper divisors (84282384).

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

42978816 is an equidigital number, since it uses as much as digits as its factorization.

42978816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3136 (or 3114 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 42978816 is about 6555.8230604555. The cubic root of 42978816 is about 350.2822648174.

The spelling of 42978816 in words is "forty-two million, nine hundred seventy-eight thousand, eight hundred sixteen".