628562709 has 12 divisors (see below), whose sum is σ = 961331436. Its totient is φ = 394392192.

The previous prime is 628562707. The next prime is 628562729. The reversal of 628562709 is 907265826.

It can be written as a sum of positive squares in 2 ways, for example, as 184280625 + 444282084 = 13575^2 + 21078^2 .

It is not a de Polignac number, because 628562709 - 2¹ = 628562707 is a prime.

It is a super-3 number, since 3×628562709³ (a number of 27 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628562707) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2053974 + ... + 2054279.

It is an arithmetic number, because the mean of its divisors is an integer number (80110953).

Almost surely, 2^628562709 is an apocalyptic number.

It is an amenable number.

628562709 is a deficient number, since it is larger than the sum of its proper divisors (332768727).

628562709 is a wasteful number, since it uses less digits than its factorization.

628562709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4108276 (or 4108273 counting only the distinct ones).

The product of its (nonzero) digits is 362880, while the sum is 45.

The square root of 628562709 is about 25071.1529252246. The cubic root of 628562709 is about 856.6094686603.

The spelling of 628562709 in words is "six hundred twenty-eight million, five hundred sixty-two thousand, seven hundred nine".