628929305 has 4 divisors (see below), whose sum is σ = 754715172. Its totient is φ = 503143440.

The previous prime is 628929253. The next prime is 628929307. The reversal of 628929305 is 503929826.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 503929826 = 2 ⋅251964913.

It can be written as a sum of positive squares in 2 ways, for example, as 401160841 + 227768464 = 20029^2 + 15092^2 .

It is not a de Polignac number, because 628929305 - 2¹⁸ = 628667161 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (628929307) 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, 62892926 + ... + 62892935.

It is an arithmetic number, because the mean of its divisors is an integer number (188678793).

Almost surely, 2^628929305 is an apocalyptic number.

It is an amenable number.

628929305 is a deficient number, since it is larger than the sum of its proper divisors (125785867).

628929305 is a wasteful number, since it uses less digits than its factorization.

628929305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 125785866.

The product of its (nonzero) digits is 233280, while the sum is 44.

The square root of 628929305 is about 25078.4629712429. The cubic root of 628929305 is about 856.7759694563.

The spelling of 628929305 in words is "six hundred twenty-eight million, nine hundred twenty-nine thousand, three hundred five".