628934311 has 4 divisors (see below), whose sum is σ = 632193232. Its totient is φ = 625675392.

The previous prime is 628934309. The next prime is 628934351. The reversal of 628934311 is 113439826.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 113439826 = 2 ⋅56719913.

It is a cyclic number.

It is not a de Polignac number, because 628934311 - 2¹ = 628934309 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628934351) 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, 1629171 + ... + 1629556.

It is an arithmetic number, because the mean of its divisors is an integer number (158048308).

Almost surely, 2^628934311 is an apocalyptic number.

628934311 is a deficient number, since it is larger than the sum of its proper divisors (3258921).

628934311 is a wasteful number, since it uses less digits than its factorization.

628934311 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3258920.

The product of its digits is 31104, while the sum is 37.

The square root of 628934311 is about 25078.5627777989. The cubic root of 628934311 is about 856.7782426366.

The spelling of 628934311 in words is "six hundred twenty-eight million, nine hundred thirty-four thousand, three hundred eleven".