628178285 has 24 divisors (see below), whose sum is σ = 923044320. Its totient is φ = 408076704.

The previous prime is 628178281. The next prime is 628178293. The reversal of 628178285 is 582871826.

It is not a de Polignac number, because 628178285 - 2² = 628178281 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628178281) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 62819 + ... + 72128.

It is an arithmetic number, because the mean of its divisors is an integer number (38460180).

Almost surely, 2^628178285 is an apocalyptic number.

It is an amenable number.

628178285 is a deficient number, since it is larger than the sum of its proper divisors (294866035).

628178285 is a wasteful number, since it uses less digits than its factorization.

628178285 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134985 (or 134978 counting only the distinct ones).

The product of its digits is 430080, while the sum is 47.

The square root of 628178285 is about 25063.4850928597. The cubic root of 628178285 is about 856.4348011799.

The spelling of 628178285 in words is "six hundred twenty-eight million, one hundred seventy-eight thousand, two hundred eighty-five".