628211893 has 4 divisors (see below), whose sum is σ = 629340300. Its totient is φ = 627083488.

The previous prime is 628211887. The next prime is 628211911. The reversal of 628211893 is 398112826.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 289578289 + 338633604 = 17017^2 + 18402^2 .

It is a cyclic number.

It is not a de Polignac number, because 628211893 - 2¹³ = 628203701 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 (628211803) 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, 563368 + ... + 564481.

It is an arithmetic number, because the mean of its divisors is an integer number (157335075).

Almost surely, 2^628211893 is an apocalyptic number.

It is an amenable number.

628211893 is a deficient number, since it is larger than the sum of its proper divisors (1128407).

628211893 is a wasteful number, since it uses less digits than its factorization.

628211893 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1128406.

The product of its digits is 41472, while the sum is 40.

The square root of 628211893 is about 25064.1555413303. The cubic root of 628211893 is about 856.4500742047.

It can be divided in two parts, 628 and 211893, that added together give a square (212521 = 461²).

The spelling of 628211893 in words is "six hundred twenty-eight million, two hundred eleven thousand, eight hundred ninety-three".