628785385 has 16 divisors (see below), whose sum is σ = 788092416. Its totient is φ = 480703168.

The previous prime is 628785383. The next prime is 628785401. The reversal of 628785385 is 583587826.

It is a cyclic number.

It is not a de Polignac number, because 628785385 - 2¹ = 628785383 is a prime.

It is a Duffinian 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 15 ways as a sum of consecutive naturals, for example, 169167 + ... + 172843.

It is an arithmetic number, because the mean of its divisors is an integer number (49255776).

Almost surely, 2^628785385 is an apocalyptic number.

It is an amenable number.

628785385 is a deficient number, since it is larger than the sum of its proper divisors (159307031).

628785385 is a wasteful number, since it uses less digits than its factorization.

628785385 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5192.

The product of its digits is 3225600, while the sum is 52.

The square root of 628785385 is about 25075.5934127191. The cubic root of 628785385 is about 856.7106114988.

The spelling of 628785385 in words is "six hundred twenty-eight million, seven hundred eighty-five thousand, three hundred eighty-five".