621768844 has 48 divisors (see below), whose sum is σ = 1213228800. Its totient is φ = 277459776.

The previous prime is 621768841. The next prime is 621768857. The reversal of 621768844 is 448867126.

It is a Harshad number since it is a multiple of its sum of digits (46).

It is a junction number, because it is equal to n+sod(n) for n = 621768794 and 621768803.

It is not an unprimeable number, because it can be changed into a prime (621768841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 114462 + ... + 119770.

It is an arithmetic number, because the mean of its divisors is an integer number (25275600).

Almost surely, 2^621768844 is an apocalyptic number.

It is an amenable number.

621768844 is a deficient number, since it is larger than the sum of its proper divisors (591459956).

621768844 is a wasteful number, since it uses less digits than its factorization.

621768844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5422 (or 5420 counting only the distinct ones).

The product of its digits is 516096, while the sum is 46.

The square root of 621768844 is about 24935.2931404465. The cubic root of 621768844 is about 853.5120405479.

The spelling of 621768844 in words is "six hundred twenty-one million, seven hundred sixty-eight thousand, eight hundred forty-four".