628620556 has 6 divisors (see below), whose sum is σ = 1100085980. Its totient is φ = 314310276.

The previous prime is 628620547. The next prime is 628620557. The reversal of 628620556 is 655026826.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (628620557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 78577566 + ... + 78577573.

Almost surely, 2^628620556 is an apocalyptic number.

It is an amenable number.

628620556 is a deficient number, since it is larger than the sum of its proper divisors (471465424).

628620556 is a wasteful number, since it uses less digits than its factorization.

628620556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 157155143 (or 157155141 counting only the distinct ones).

The product of its (nonzero) digits is 172800, while the sum is 40.

The square root of 628620556 is about 25072.3065552414. The cubic root of 628620556 is about 856.6357459472.

The spelling of 628620556 in words is "six hundred twenty-eight million, six hundred twenty thousand, five hundred fifty-six".