628959566 has 4 divisors (see below), whose sum is σ = 943439352. Its totient is φ = 314479782.

The previous prime is 628959521. The next prime is 628959577. The reversal of 628959566 is 665959826.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 157239890 + ... + 157239893.

It is an arithmetic number, because the mean of its divisors is an integer number (235859838).

Almost surely, 2^628959566 is an apocalyptic number.

628959566 is a deficient number, since it is larger than the sum of its proper divisors (314479786).

628959566 is a wasteful number, since it uses less digits than its factorization.

628959566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 314479785.

The product of its digits is 6998400, while the sum is 56.

The square root of 628959566 is about 25079.0662904343. The cubic root of 628959566 is about 856.7897105247.

The spelling of 628959566 in words is "six hundred twenty-eight million, nine hundred fifty-nine thousand, five hundred sixty-six".