628228858 has 4 divisors (see below), whose sum is σ = 942343290. Its totient is φ = 314114428.

The previous prime is 628228847. The next prime is 628228859. The reversal of 628228858 is 858822826.

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 only one way, i.e., 522899689 + 105329169 = 22867^2 + 10263^2 .

It is not an unprimeable number, because it can be changed into a prime (628228859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157057213 + ... + 157057216.

Almost surely, 2^628228858 is an apocalyptic number.

628228858 is a deficient number, since it is larger than the sum of its proper divisors (314114432).

628228858 is a wasteful number, since it uses less digits than its factorization.

628228858 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314114431.

The product of its digits is 983040, while the sum is 49.

The square root of 628228858 is about 25064.4939705552. The cubic root of 628228858 is about 856.4577836760.

The spelling of 628228858 in words is "six hundred twenty-eight million, two hundred twenty-eight thousand, eight hundred fifty-eight".