42272778 has 64 divisors (see below), whose sum is σ = 95800320. Its totient is φ = 12364800.

The previous prime is 42272771. The next prime is 42272801. The reversal of 42272778 is 87727224.

It is a happy number.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (42272771) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 91468 + ... + 91928.

It is an arithmetic number, because the mean of its divisors is an integer number (1496880).

Almost surely, 2^42272778 is an apocalyptic number.

42272778 is an abundant number, since it is smaller than the sum of its proper divisors (53527542).

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

42272778 is a wasteful number, since it uses less digits than its factorization.

42272778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 543.

The product of its digits is 87808, while the sum is 39.

The square root of 42272778 is about 6501.7519177526. The cubic root of 42272778 is about 348.3535678566.

The spelling of 42272778 in words is "forty-two million, two hundred seventy-two thousand, seven hundred seventy-eight".