628521 has 8 divisors (see below), whose sum is σ = 874560. Its totient is φ = 400752.

The previous prime is 628499. The next prime is 628547. The reversal of 628521 is 125826.

628521 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is not a de Polignac number, because 628521 - 2¹³ = 620329 is a prime.

It is an Ulam number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 628491 and 628500.

It is not an unprimeable number, because it can be changed into a prime (628561) 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, 4486 + ... + 4623.

It is an arithmetic number, because the mean of its divisors is an integer number (109320).

2⁶²⁸⁵²¹ is an apocalyptic number.

It is an amenable number.

628521 is a deficient number, since it is larger than the sum of its proper divisors (246039).

628521 is a wasteful number, since it uses less digits than its factorization.

628521 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9135.

The product of its digits is 960, while the sum is 24.

The square root of 628521 is about 792.7931634418. The cubic root of 628521 is about 85.6590521140.

The spelling of 628521 in words is "six hundred twenty-eight thousand, five hundred twenty-one".