628385893 has 2 divisors, whose sum is σ = 628385894. Its totient is φ = 628385892.

The previous prime is 628385887. The next prime is 628385929. The reversal of 628385893 is 398583826.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 426092164 + 202293729 = 20642^2 + 14223^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628385893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 628385893.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (628385843) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 314192946 + 314192947.

It is an arithmetic number, because the mean of its divisors is an integer number (314192947).

Almost surely, 2^628385893 is an apocalyptic number.

It is an amenable number.

628385893 is a deficient number, since it is larger than the sum of its proper divisors (1).

628385893 is an equidigital number, since it uses as much as digits as its factorization.

628385893 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2488320, while the sum is 52.

The square root of 628385893 is about 25067.6263934183. The cubic root of 628385893 is about 856.5291391179.

The spelling of 628385893 in words is "six hundred twenty-eight million, three hundred eighty-five thousand, eight hundred ninety-three".