628461 has 6 divisors (see below), whose sum is σ = 907790. Its totient is φ = 418968.

The previous prime is 628447. The next prime is 628477. The reversal of 628461 is 164826.

It can be written as a sum of positive squares in only one way, i.e., 352836 + 275625 = 594^2 + 525^2 .

It is not a de Polignac number, because 628461 - 2¹⁷ = 497389 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (628261) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 34906 + ... + 34923.

2⁶²⁸⁴⁶¹ is an apocalyptic number.

It is an amenable number.

628461 is a deficient number, since it is larger than the sum of its proper divisors (279329).

628461 is a wasteful number, since it uses less digits than its factorization.

628461 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69835 (or 69832 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 628461 is about 792.7553216472. The cubic root of 628461 is about 85.6563262933.

It can be divided in two parts, 628 and 461, that added together give a square (1089 = 33²).

The spelling of 628461 in words is "six hundred twenty-eight thousand, four hundred sixty-one".