628826561 has 8 divisors (see below), whose sum is σ = 689477184. Its totient is φ = 568756720.

The previous prime is 628826533. The next prime is 628826573. The reversal of 628826561 is 165628826.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 628826561 - 2¹⁰ = 628825537 is a prime.

It is not an unprimeable number, because it can be changed into a prime (628826501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 142925 + ... + 147258.

It is an arithmetic number, because the mean of its divisors is an integer number (86184648).

Almost surely, 2^628826561 is an apocalyptic number.

It is an amenable number.

628826561 is a deficient number, since it is larger than the sum of its proper divisors (60650623).

628826561 is a wasteful number, since it uses less digits than its factorization.

628826561 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290391.

The product of its digits is 276480, while the sum is 44.

The square root of 628826561 is about 25076.4144366773. The cubic root of 628826561 is about 856.7293116504.

The spelling of 628826561 in words is "six hundred twenty-eight million, eight hundred twenty-six thousand, five hundred sixty-one".