675621 has 20 divisors (see below), whose sum is σ = 1064800. Its totient is φ = 425736.

The previous prime is 675617. The next prime is 675629. The reversal of 675621 is 126576.

675621 is nontrivially palindromic in base 2.

675621 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 675621 - 2² = 675617 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Duffinian number.

It is a Curzon 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 675621.

It is not an unprimeable number, because it can be changed into a prime (675629) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 1320 + ... + 1758.

It is an arithmetic number, because the mean of its divisors is an integer number (53240).

2⁶⁷⁵⁶²¹ is an apocalyptic number.

It is an amenable number.

675621 is a deficient number, since it is larger than the sum of its proper divisors (389179).

675621 is a wasteful number, since it uses less digits than its factorization.

675621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 470 (or 461 counting only the distinct ones).

The product of its digits is 2520, while the sum is 27.

The square root of 675621 is about 821.9616779388. The cubic root of 675621 is about 87.7474248642.

It can be divided in two parts, 675 and 621, that added together give a 4-th power (1296 = 6⁴).

The spelling of 675621 in words is "six hundred seventy-five thousand, six hundred twenty-one".