42428778 has 32 divisors (see below), whose sum is σ = 97251840. Its totient is φ = 12088560.

The previous prime is 42428759. The next prime is 42428791. The reversal of 42428778 is 87782424.

42428778 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is an unprimeable number.

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, 16393 + ... + 18803.

It is an arithmetic number, because the mean of its divisors is an integer number (3039120).

Almost surely, 2^42428778 is an apocalyptic number.

42428778 is an abundant number, since it is smaller than the sum of its proper divisors (54823062).

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

42428778 is a wasteful number, since it uses less digits than its factorization.

42428778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2842.

The product of its digits is 200704, while the sum is 42.

The square root of 42428778 is about 6513.7376367183. The cubic root of 42428778 is about 348.7815536513.

The spelling of 42428778 in words is "forty-two million, four hundred twenty-eight thousand, seven hundred seventy-eight".