628654251 has 4 divisors (see below), whose sum is σ = 838205672. Its totient is φ = 419102832.

The previous prime is 628654249. The next prime is 628654297. The reversal of 628654251 is 152456826.

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

It is not a de Polignac number, because 628654251 - 2¹ = 628654249 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628654231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104775706 + ... + 104775711.

It is an arithmetic number, because the mean of its divisors is an integer number (209551418).

Almost surely, 2^628654251 is an apocalyptic number.

628654251 is a deficient number, since it is larger than the sum of its proper divisors (209551421).

628654251 is a wasteful number, since it uses less digits than its factorization.

628654251 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 209551420.

The product of its digits is 115200, while the sum is 39.

The square root of 628654251 is about 25072.9785027627. The cubic root of 628654251 is about 856.6510513252.

The spelling of 628654251 in words is "six hundred twenty-eight million, six hundred fifty-four thousand, two hundred fifty-one".