621314640 has 240 divisors, whose sum is σ = 2306423808. Its totient is φ = 149090304.

The previous prime is 621314633. The next prime is 621314689. The reversal of 621314640 is 46413126.

621314640 is a `hidden beast` number, since 6 + 2 + 1 + 3 + 14 + 640 = 666.

621314640 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (240).

It is a congruent number.

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, 280417 + ... + 282623.

Almost surely, 2^621314640 is an apocalyptic number.

621314640 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 621314640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1153211904).

621314640 is an abundant number, since it is smaller than the sum of its proper divisors (1685109168).

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

621314640 is a wasteful number, since it uses less digits than its factorization.

621314640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2266 (or 2257 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 27.

The square root of 621314640 is about 24926.1838234416. The cubic root of 621314640 is about 853.3041588876.

Adding to 621314640 its reverse (46413126), we get a palindrome (667727766).

The spelling of 621314640 in words is "six hundred twenty-one million, three hundred fourteen thousand, six hundred forty".