628877969 has 4 divisors (see below), whose sum is σ = 636454896. Its totient is φ = 621301044.

The previous prime is 628877959. The next prime is 628877981. The reversal of 628877969 is 969778826.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 969778826 = 2 ⋅484889413.

It is a cyclic number.

It is not a de Polignac number, because 628877969 - 2¹² = 628873873 is a prime.

It is a super-2 number, since 2×628877969² = 790974999787129922, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628877929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3788339 + ... + 3788504.

It is an arithmetic number, because the mean of its divisors is an integer number (159113724).

Almost surely, 2^628877969 is an apocalyptic number.

It is an amenable number.

628877969 is a deficient number, since it is larger than the sum of its proper divisors (7576927).

628877969 is an equidigital number, since it uses as much as digits as its factorization.

628877969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7576926.

The product of its digits is 18289152, while the sum is 62.

The square root of 628877969 is about 25077.4394426544. The cubic root of 628877969 is about 856.7526575368.

The spelling of 628877969 in words is "six hundred twenty-eight million, eight hundred seventy-seven thousand, nine hundred sixty-nine".