628611521 has 8 divisors (see below), whose sum is σ = 649689600. Its totient is φ = 607583520.

The previous prime is 628611517. The next prime is 628611559. The reversal of 628611521 is 125116826.

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 628611521 - 2² = 628611517 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (628611121) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13925 + ... + 38093.

It is an arithmetic number, because the mean of its divisors is an integer number (81211200).

Almost surely, 2^628611521 is an apocalyptic number.

It is an amenable number.

628611521 is a deficient number, since it is larger than the sum of its proper divisors (21078079).

628611521 is a wasteful number, since it uses less digits than its factorization.

628611521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25039.

The product of its digits is 5760, while the sum is 32.

The square root of 628611521 is about 25072.1263757185. The cubic root of 628611521 is about 856.6316418598.

The spelling of 628611521 in words is "six hundred twenty-eight million, six hundred eleven thousand, five hundred twenty-one".