628229645 has 12 divisors (see below), whose sum is σ = 800831604. Its totient is φ = 473018880.

The previous prime is 628229621. The next prime is 628229653. The reversal of 628229645 is 546922826.

It can be written as a sum of positive squares in 6 ways, for example, as 1378276 + 626851369 = 1174^2 + 25037^2 .

It is not a de Polignac number, because 628229645 - 2⁸ = 628229389 is a prime.

It is a super-3 number, since 3×628229645³ (a number of 27 digits) contains 333 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 628229596 and 628229605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 215936 + ... + 218825.

It is an arithmetic number, because the mean of its divisors is an integer number (66735967).

Almost surely, 2^628229645 is an apocalyptic number.

It is an amenable number.

628229645 is a deficient number, since it is larger than the sum of its proper divisors (172601959).

628229645 is a wasteful number, since it uses less digits than its factorization.

628229645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 434800 (or 434783 counting only the distinct ones).

The product of its digits is 414720, while the sum is 44.

The square root of 628229645 is about 25064.5096700494. The cubic root of 628229645 is about 856.4581413121.

The spelling of 628229645 in words is "six hundred twenty-eight million, two hundred twenty-nine thousand, six hundred forty-five".