422778673 has 4 divisors (see below), whose sum is σ = 422835300. Its totient is φ = 422722048.

The previous prime is 422778649. The next prime is 422778689. The reversal of 422778673 is 376877224.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 101042704 + 321735969 = 10052^2 + 17937^2 .

It is a cyclic number.

It is not a de Polignac number, because 422778673 - 2¹⁷ = 422647601 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (422778073) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15040 + ... + 32737.

It is an arithmetic number, because the mean of its divisors is an integer number (105708825).

Almost surely, 2^422778673 is an apocalyptic number.

It is an amenable number.

422778673 is a deficient number, since it is larger than the sum of its proper divisors (56627).

422778673 is an equidigital number, since it uses as much as digits as its factorization.

422778673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 56626.

The product of its digits is 790272, while the sum is 46.

The square root of 422778673 is about 20561.5824536926. The cubic root of 422778673 is about 750.5351280191.

The spelling of 422778673 in words is "four hundred twenty-two million, seven hundred seventy-eight thousand, six hundred seventy-three".