628422278 has 32 divisors (see below), whose sum is σ = 1052663040. Its totient is φ = 278964000.

The previous prime is 628422271. The next prime is 628422329. The reversal of 628422278 is 872224826.

It is a Smith number, since the sum of its digits (41) 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 a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628422271) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 168413 + ... + 172103.

It is an arithmetic number, because the mean of its divisors is an integer number (32895720).

Almost surely, 2^628422278 is an apocalyptic number.

628422278 is a deficient number, since it is larger than the sum of its proper divisors (424240762).

628422278 is a wasteful number, since it uses less digits than its factorization.

628422278 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3884.

The product of its digits is 172032, while the sum is 41.

The square root of 628422278 is about 25068.3521197545. The cubic root of 628422278 is about 856.5456704731.

The spelling of 628422278 in words is "six hundred twenty-eight million, four hundred twenty-two thousand, two hundred seventy-eight".