628209279 has 12 divisors (see below), whose sum is σ = 960790896. Its totient is φ = 394170432.

The previous prime is 628209269. The next prime is 628209299. The reversal of 628209279 is 972902826.

It is not a de Polignac number, because 628209279 - 2⁹ = 628208767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628209209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2052819 + ... + 2053124.

It is an arithmetic number, because the mean of its divisors is an integer number (80065908).

Almost surely, 2^628209279 is an apocalyptic number.

628209279 is a deficient number, since it is larger than the sum of its proper divisors (332581617).

628209279 is a wasteful number, since it uses less digits than its factorization.

628209279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4105966 (or 4105963 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 45.

The square root of 628209279 is about 25064.1033950947. The cubic root of 628209279 is about 856.4488863021.

The spelling of 628209279 in words is "six hundred twenty-eight million, two hundred nine thousand, two hundred seventy-nine".