628036813 has 4 divisors (see below), whose sum is σ = 629393728. Its totient is φ = 626679900.

The previous prime is 628036793. The next prime is 628036817. The reversal of 628036813 is 318630826.

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 a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-628036813 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 (628036817) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 677763 + ... + 678688.

It is an arithmetic number, because the mean of its divisors is an integer number (157348432).

Almost surely, 2^628036813 is an apocalyptic number.

It is an amenable number.

628036813 is a deficient number, since it is larger than the sum of its proper divisors (1356915).

628036813 is a wasteful number, since it uses less digits than its factorization.

628036813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1356914.

The product of its (nonzero) digits is 41472, while the sum is 37.

The square root of 628036813 is about 25060.6626608316. The cubic root of 628036813 is about 856.3705038067.

It can be divided in two parts, 628036 and 813, that added together give a square (628849 = 793²).

The spelling of 628036813 in words is "six hundred twenty-eight million, thirty-six thousand, eight hundred thirteen".