628432569 has 12 divisors (see below), whose sum is σ = 908841700. Its totient is φ = 418444704.

The previous prime is 628432559. The next prime is 628432577. The reversal of 628432569 is 965234826.

628432569 is a `hidden beast` number, since 6 + 2 + 84 + 3 + 2 + 569 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 177422400 + 451010169 = 13320^2 + 21237^2 .

It is not a de Polignac number, because 628432569 - 2⁸ = 628432313 is a prime.

It is a super-2 number, since 2×628432569² = 789854987559879522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628432549) 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 11 ways as a sum of consecutive naturals, for example, 34654 + ... + 49575.

Almost surely, 2^628432569 is an apocalyptic number.

It is an amenable number.

628432569 is a deficient number, since it is larger than the sum of its proper divisors (280409131).

628432569 is a wasteful number, since it uses less digits than its factorization.

628432569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85064 (or 85061 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 628432569 is about 25068.5573777192. The cubic root of 628432569 is about 856.5503460253.

The spelling of 628432569 in words is "six hundred twenty-eight million, four hundred thirty-two thousand, five hundred sixty-nine".