628647 has 4 divisors (see below), whose sum is σ = 838200. Its totient is φ = 419096.

The previous prime is 628591. The next prime is 628651. The reversal of 628647 is 746826.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 628647 - 2⁶ = 628583 is a prime.

It is a D-number.

628647 is a lucky number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 628647.

It is not an unprimeable number, because it can be changed into a prime (628687) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 104772 + ... + 104777.

It is an arithmetic number, because the mean of its divisors is an integer number (209550).

2⁶²⁸⁶⁴⁷ is an apocalyptic number.

628647 is a deficient number, since it is larger than the sum of its proper divisors (209553).

628647 is a wasteful number, since it uses less digits than its factorization.

628647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 209552.

The product of its digits is 16128, while the sum is 33.

The square root of 628647 is about 792.8726253315. The cubic root of 628647 is about 85.6647757729.

It can be divided in two parts, 628 and 647, that added together give a triangular number (1275 = T₅₀).

The spelling of 628647 in words is "six hundred twenty-eight thousand, six hundred forty-seven".