628189394 has 16 divisors (see below), whose sum is σ = 1111635456. Its totient is φ = 260539200.

The previous prime is 628189391. The next prime is 628189399. The reversal of 628189394 is 493981826.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (628189391) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 723287 + ... + 724154.

It is an arithmetic number, because the mean of its divisors is an integer number (69477216).

Almost surely, 2^628189394 is an apocalyptic number.

628189394 is a deficient number, since it is larger than the sum of its proper divisors (483446062).

628189394 is a wasteful number, since it uses less digits than its factorization.

628189394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1447481.

The product of its digits is 746496, while the sum is 50.

The square root of 628189394 is about 25063.7067091043. The cubic root of 628189394 is about 856.4398496820.

The spelling of 628189394 in words is "six hundred twenty-eight million, one hundred eighty-nine thousand, three hundred ninety-four".