628931569 has 4 divisors (see below), whose sum is σ = 718778944. Its totient is φ = 539084196.

The previous prime is 628931557. The next prime is 628931579. The reversal of 628931569 is 965139826.

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.

It is not a de Polignac number, because 628931569 - 2¹⁹ = 628407281 is a prime.

It is a super-2 number, since 2×628931569² = 791109836969603522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628931509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 44923677 + ... + 44923690.

It is an arithmetic number, because the mean of its divisors is an integer number (179694736).

Almost surely, 2^628931569 is an apocalyptic number.

It is an amenable number.

628931569 is a deficient number, since it is larger than the sum of its proper divisors (89847375).

628931569 is an equidigital number, since it uses as much as digits as its factorization.

628931569 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 89847374.

The product of its digits is 699840, while the sum is 49.

The square root of 628931569 is about 25078.5081095347. The cubic root of 628931569 is about 856.7769975201.

The spelling of 628931569 in words is "six hundred twenty-eight million, nine hundred thirty-one thousand, five hundred sixty-nine".