621443648 has 28 divisors (see below), whose sum is σ = 1409346432. Its totient is φ = 266332800.

The previous prime is 621443623. The next prime is 621443743. The reversal of 621443648 is 846344126.

It is a tau number, because it is divible by the number of its divisors (28).

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 693128 + ... + 694023.

Almost surely, 2^621443648 is an apocalyptic number.

It is an amenable number.

621443648 is an abundant number, since it is smaller than the sum of its proper divisors (787902784).

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

621443648 is a wasteful number, since it uses less digits than its factorization.

621443648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1387170 (or 1387160 counting only the distinct ones).

The product of its digits is 110592, while the sum is 38.

The square root of 621443648 is about 24928.7714899872. The cubic root of 621443648 is about 853.3632140144.

The spelling of 621443648 in words is "six hundred twenty-one million, four hundred forty-three thousand, six hundred forty-eight".