621427989952 has 504 divisors, whose sum is σ = 1631654384640. Its totient is φ = 229806720000.

The previous prime is 621427989937. The next prime is 621427989953. The reversal of 621427989952 is 259989724126.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621427989953) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 4115417077 + ... + 4115417227.

Almost surely, 2^621427989952 is an apocalyptic number.

621427989952 is a gapful number since it is divisible by the number (62) 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 621427989952, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (815827192320).

621427989952 is an abundant number, since it is smaller than the sum of its proper divisors (1010226394688).

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

621427989952 is a wasteful number, since it uses less digits than its factorization.

621427989952 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 333 (or 281 counting only the distinct ones).

The product of its digits is 39191040, while the sum is 64.

The spelling of 621427989952 in words is "six hundred twenty-one billion, four hundred twenty-seven million, nine hundred eighty-nine thousand, nine hundred fifty-two".