621648 has 40 divisors (see below), whose sum is σ = 1785600. Its totient is φ = 207072.

The previous prime is 621641. The next prime is 621671. The reversal of 621648 is 846126.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 288 + ... + 1151.

It is an arithmetic number, because the mean of its divisors is an integer number (44640).

2⁶²¹⁶⁴⁸ is an apocalyptic number.

It is an amenable number.

621648 is an abundant number, since it is smaller than the sum of its proper divisors (1163952).

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

621648 is a wasteful number, since it uses less digits than its factorization.

621648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1456 (or 1444 counting only the distinct ones).

The product of its digits is 2304, while the sum is 27.

The square root of 621648 is about 788.4465739668. The cubic root of 621648 is about 85.3456742134.

The spelling of 621648 in words is "six hundred twenty-one thousand, six hundred forty-eight".