42456778 has 16 divisors (see below), whose sum is σ = 78382080. Its totient is φ = 16796016.

The previous prime is 42456751. The next prime is 42456779. The reversal of 42456778 is 87765424.

It is not an unprimeable number, because it can be changed into a prime (42456779) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 116458 + ... + 116821.

It is an arithmetic number, because the mean of its divisors is an integer number (4898880).

Almost surely, 2^42456778 is an apocalyptic number.

42456778 is a deficient number, since it is larger than the sum of its proper divisors (35925302).

42456778 is a wasteful number, since it uses less digits than its factorization.

42456778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 233301.

The product of its digits is 376320, while the sum is 43.

The square root of 42456778 is about 6515.8865858761. The cubic root of 42456778 is about 348.8582605193.

It can be divided in two parts, 42456 and 778, that added together give a palindrome (43234).

The spelling of 42456778 in words is "forty-two million, four hundred fifty-six thousand, seven hundred seventy-eight".