621228648 has 32 divisors (see below), whose sum is σ = 1560888000. Its totient is φ = 206034048.

The previous prime is 621228589. The next prime is 621228649. The reversal of 621228648 is 846822126.

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

It is not an unprimeable number, because it can be changed into a prime (621228649) 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, 60261 + ... + 69812.

It is an arithmetic number, because the mean of its divisors is an integer number (48777750).

Almost surely, 2^621228648 is an apocalyptic number.

It is an amenable number.

621228648 is an abundant number, since it is smaller than the sum of its proper divisors (939659352).

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

621228648 is a wasteful number, since it uses less digits than its factorization.

621228648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130281 (or 130277 counting only the distinct ones).

The product of its digits is 73728, while the sum is 39.

The square root of 621228648 is about 24924.4588306346. The cubic root of 621228648 is about 853.2647903658.

The spelling of 621228648 in words is "six hundred twenty-one million, two hundred twenty-eight thousand, six hundred forty-eight".