628281109 has 4 divisors (see below), whose sum is σ = 633077280. Its totient is φ = 623484940.

The previous prime is 628281103. The next prime is 628281139. The reversal of 628281109 is 901182826.

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 628281109 - 2⁵ = 628281077 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 (628281103) 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, 2397889 + ... + 2398150.

It is an arithmetic number, because the mean of its divisors is an integer number (158269320).

Almost surely, 2^628281109 is an apocalyptic number.

It is an amenable number.

628281109 is a deficient number, since it is larger than the sum of its proper divisors (4796171).

628281109 is a wasteful number, since it uses less digits than its factorization.

628281109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4796170.

The product of its (nonzero) digits is 13824, while the sum is 37.

The square root of 628281109 is about 25065.5362799203. The cubic root of 628281109 is about 856.4815274303.

The spelling of 628281109 in words is "six hundred twenty-eight million, two hundred eighty-one thousand, one hundred nine".