621840000 has 160 divisors (see below), whose sum is σ = 2064839040. Its totient is φ = 165760000.

The previous prime is 621839971. The next prime is 621840001. The reversal of 621840000 is 48126.

It is a tau number, because it is divible by the number of its divisors (160).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621840001) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 238705 + ... + 241295.

It is an arithmetic number, because the mean of its divisors is an integer number (12905244).

Almost surely, 2^621840000 is an apocalyptic number.

621840000 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621840000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1032419520).

621840000 is an abundant number, since it is smaller than the sum of its proper divisors (1442999040).

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

621840000 is an equidigital number, since it uses as much as digits as its factorization.

621840000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2628 (or 2601 counting only the distinct ones).

The product of its (nonzero) digits is 384, while the sum is 21.

The square root of 621840000 is about 24936.7199126108. The cubic root of 621840000 is about 853.5445982992.

Adding to 621840000 its reverse (48126), we get a palindrome (621888126).

The spelling of 621840000 in words is "six hundred twenty-one million, eight hundred forty thousand".