628023813 has 4 divisors (see below), whose sum is σ = 837365088. Its totient is φ = 418682540.

The previous prime is 628023793. The next prime is 628023821. The reversal of 628023813 is 318320826.

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 not a de Polignac number, because 628023813 - 2¹⁶ = 627958277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628023833) 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, 104670633 + ... + 104670638.

It is an arithmetic number, because the mean of its divisors is an integer number (209341272).

Almost surely, 2^628023813 is an apocalyptic number.

It is an amenable number.

628023813 is a deficient number, since it is larger than the sum of its proper divisors (209341275).

628023813 is a wasteful number, since it uses less digits than its factorization.

628023813 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209341274.

The product of its (nonzero) digits is 13824, while the sum is 33.

The square root of 628023813 is about 25060.4032888539. The cubic root of 628023813 is about 856.3645949740.

The spelling of 628023813 in words is "six hundred twenty-eight million, twenty-three thousand, eight hundred thirteen".