628695658 has 4 divisors (see below), whose sum is σ = 943043490. Its totient is φ = 314347828.

The previous prime is 628695629. The next prime is 628695659. The reversal of 628695658 is 856596826.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 856596826 = 2 ⋅428298413.

It can be written as a sum of positive squares in only one way, i.e., 475109209 + 153586449 = 21797^2 + 12393^2 .

It is a junction number, because it is equal to n+sod(n) for n = 628695599 and 628695608.

It is not an unprimeable number, because it can be changed into a prime (628695659) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157173913 + ... + 157173916.

Almost surely, 2^628695658 is an apocalyptic number.

628695658 is a deficient number, since it is larger than the sum of its proper divisors (314347832).

628695658 is a wasteful number, since it uses less digits than its factorization.

628695658 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314347831.

The product of its digits is 6220800, while the sum is 55.

The square root of 628695658 is about 25073.8042187459. The cubic root of 628695658 is about 856.6698589985.

The spelling of 628695658 in words is "six hundred twenty-eight million, six hundred ninety-five thousand, six hundred fifty-eight".