628785386 has 8 divisors (see below), whose sum is σ = 945243300. Its totient is φ = 313704288.

The previous prime is 628785383. The next prime is 628785401. The reversal of 628785386 is 683587826.

It can be written as a sum of positive squares in 2 ways, for example, as 628454761 + 330625 = 25069^2 + 575^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (628785383) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 343061 + ... + 344888.

Almost surely, 2^628785386 is an apocalyptic number.

628785386 is a deficient number, since it is larger than the sum of its proper divisors (316457914).

628785386 is a wasteful number, since it uses less digits than its factorization.

628785386 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 688408.

The product of its digits is 3870720, while the sum is 53.

The square root of 628785386 is about 25075.5934326588. The cubic root of 628785386 is about 856.7106119530.

The spelling of 628785386 in words is "six hundred twenty-eight million, seven hundred eighty-five thousand, three hundred eighty-six".