621631712 has 48 divisors (see below), whose sum is σ = 1320791472. Its totient is φ = 286295040.

The previous prime is 621631711. The next prime is 621631739. The reversal of 621631712 is 217136126.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621631711) 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, 236228 + ... + 238844.

It is an arithmetic number, because the mean of its divisors is an integer number (27516489).

Almost surely, 2^621631712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 621631712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (660395736).

621631712 is an abundant number, since it is smaller than the sum of its proper divisors (699159760).

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

621631712 is a wasteful number, since it uses less digits than its factorization.

621631712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3211 (or 3203 counting only the distinct ones).

The product of its digits is 3024, while the sum is 29.

The square root of 621631712 is about 24932.5432316882. The cubic root of 621631712 is about 853.4492881708.

Adding to 621631712 its reverse (217136126), we get a palindrome (838767838).

The spelling of 621631712 in words is "six hundred twenty-one million, six hundred thirty-one thousand, seven hundred twelve".