621880 has 32 divisors (see below), whose sum is σ = 1599840. Its totient is φ = 213120.

The previous prime is 621871. The next prime is 621883. The reversal of 621880 is 88126.

It is a Smith number, since the sum of its digits (25) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621883) 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 7 ways as a sum of consecutive naturals, for example, 831 + ... + 1390.

It is an arithmetic number, because the mean of its divisors is an integer number (49995).

2⁶²¹⁸⁸⁰ is an apocalyptic number.

It is an amenable number.

621880 is an abundant number, since it is smaller than the sum of its proper divisors (977960).

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

621880 is a wasteful number, since it uses less digits than its factorization.

621880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2239 (or 2235 counting only the distinct ones).

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 621880 is about 788.5936849861. The cubic root of 621880 is about 85.3562899390.

The spelling of 621880 in words is "six hundred twenty-one thousand, eight hundred eighty".