621670 has 32 divisors (see below), whose sum is σ = 1306368. Its totient is φ = 208608.

The previous prime is 621641. The next prime is 621671. The reversal of 621670 is 76126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 5757 + ... + 5863.

It is an arithmetic number, because the mean of its divisors is an integer number (40824).

2⁶²¹⁶⁷⁰ is an apocalyptic number.

621670 is an abundant number, since it is smaller than the sum of its proper divisors (684698).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

621670 is a wasteful number, since it uses less digits than its factorization.

621670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 204.

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

The square root of 621670 is about 788.4605253277. The cubic root of 621670 is about 85.3466809904.

Adding to 621670 its reverse (76126), we get a palindrome (697796).

The spelling of 621670 in words is "six hundred twenty-one thousand, six hundred seventy".