670621 has 4 divisors (see below), whose sum is σ = 766432. Its totient is φ = 574812.

The previous prime is 670619. The next prime is 670627. The reversal of 670621 is 126076.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 670621 - 2¹ = 670619 is a prime.

It is a Duffinian number.

670621 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 670592 and 670601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (670627) 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, 47895 + ... + 47908.

It is an arithmetic number, because the mean of its divisors is an integer number (191608).

2⁶⁷⁰⁶²¹ is an apocalyptic number.

It is an amenable number.

670621 is a deficient number, since it is larger than the sum of its proper divisors (95811).

670621 is an equidigital number, since it uses as much as digits as its factorization.

670621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95810.

The product of its (nonzero) digits is 504, while the sum is 22.

The square root of 670621 is about 818.9145254543. The cubic root of 670621 is about 87.5304275131.

Adding to 670621 its reverse (126076), we get a palindrome (796697).

The spelling of 670621 in words is "six hundred seventy thousand, six hundred twenty-one".