621304320 has 480 divisors, whose sum is σ = 2507839488. Its totient is φ = 130056192.

The previous prime is 621304301. The next prime is 621304331. The reversal of 621304320 is 23403126.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (480).

It is a Harshad number since it is a multiple of its sum of digits (21).

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 4892097 + ... + 4892223.

Almost surely, 2^621304320 is an apocalyptic number.

621304320 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 621304320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1253919744).

621304320 is an abundant number, since it is smaller than the sum of its proper divisors (1886535168).

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

621304320 is a wasteful number, since it uses less digits than its factorization.

621304320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 180 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 21.

The square root of 621304320 is about 24925.9768113508. The cubic root of 621304320 is about 853.2994344173.

Adding to 621304320 its reverse (23403126), we get a palindrome (644707446).

The spelling of 621304320 in words is "six hundred twenty-one million, three hundred four thousand, three hundred twenty".