628506831 has 8 divisors (see below), whose sum is σ = 838208944. Its totient is φ = 418904640.

The previous prime is 628506811. The next prime is 628506841. The reversal of 628506831 is 138605826.

It is a happy number.

628506831 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 628506831 - 2¹⁹ = 627982543 is a prime.

It is a super-2 number, since 2×628506831² = 790041673227325122, which contains 22 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 628506831.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628506811) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8806 + ... + 36531.

It is an arithmetic number, because the mean of its divisors is an integer number (104776118).

Almost surely, 2^628506831 is an apocalyptic number.

628506831 is a deficient number, since it is larger than the sum of its proper divisors (209702113).

628506831 is a wasteful number, since it uses less digits than its factorization.

628506831 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49961.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 628506831 is about 25070.0385121364. The cubic root of 628506831 is about 856.5840842705.

The spelling of 628506831 in words is "six hundred twenty-eight million, five hundred six thousand, eight hundred thirty-one".