628943769 has 6 divisors (see below), whose sum is σ = 908474346. Its totient is φ = 419295840.

The previous prime is 628943759. The next prime is 628943827. The reversal of 628943769 is 967349826.

It is a happy number.

628943769 is a `hidden beast` number, since 628 + 9 + 4 + 3 + 7 + 6 + 9 = 666.

It can be written as a sum of positive squares in only one way, i.e., 323568144 + 305375625 = 17988^2 + 17475^2 .

It is not a de Polignac number, because 628943769 - 2¹⁷ = 628812697 is a prime.

It is a super-2 number, since 2×628943769² = 791140529127850722, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (628943729) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34941312 + ... + 34941329.

It is an arithmetic number, because the mean of its divisors is an integer number (151412391).

Almost surely, 2^628943769 is an apocalyptic number.

It is an amenable number.

628943769 is a deficient number, since it is larger than the sum of its proper divisors (279530577).

628943769 is a wasteful number, since it uses less digits than its factorization.

628943769 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69882647 (or 69882644 counting only the distinct ones).

The product of its digits is 3919104, while the sum is 54.

The square root of 628943769 is about 25078.7513445147. The cubic root of 628943769 is about 856.7825373978.

The spelling of 628943769 in words is "six hundred twenty-eight million, nine hundred forty-three thousand, seven hundred sixty-nine".