628505 has 8 divisors (see below), whose sum is σ = 758472. Its totient is φ = 499968.

The previous prime is 628499. The next prime is 628547. The reversal of 628505 is 505826.

628505 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 30976 + 597529 = 176^2 + 773^2 .

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 628505 - 2¹⁰ = 627481 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1499 + ... + 1871.

It is an arithmetic number, because the mean of its divisors is an integer number (94809).

2⁶²⁸⁵⁰⁵ is an apocalyptic number.

It is an amenable number.

628505 is a deficient number, since it is larger than the sum of its proper divisors (129967).

628505 is a wasteful number, since it uses less digits than its factorization.

628505 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 715.

The product of its (nonzero) digits is 2400, while the sum is 26.

The square root of 628505 is about 792.7830724732. The cubic root of 628505 is about 85.6583252454.

The spelling of 628505 in words is "six hundred twenty-eight thousand, five hundred five".