628807761 has 12 divisors (see below), whose sum is σ = 908560692. Its totient is φ = 419074656.

The previous prime is 628807759. The next prime is 628807763. The reversal of 628807761 is 167708826.

628807761 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (628807759) and next prime (628807763).

It can be written as a sum of positive squares in 2 ways, for example, as 523540161 + 105267600 = 22881^2 + 10260^2 .

It is not a de Polignac number, because 628807761 - 2¹ = 628807759 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (628807763) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 26335 + ... + 44171.

It is an arithmetic number, because the mean of its divisors is an integer number (75713391).

Almost surely, 2^628807761 is an apocalyptic number.

It is an amenable number.

628807761 is a deficient number, since it is larger than the sum of its proper divisors (279752931).

628807761 is a wasteful number, since it uses less digits than its factorization.

628807761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21760 (or 21757 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 628807761 is about 25076.0395796465. The cubic root of 628807761 is about 856.7207736992.

The spelling of 628807761 in words is "six hundred twenty-eight million, eight hundred seven thousand, seven hundred sixty-one".