621489481676 has 192 divisors, whose sum is σ = 1366751232000. Its totient is φ = 241471549440.

The previous prime is 621489481673. The next prime is 621489481687. The reversal of 621489481676 is 676184984126.

It is a happy number.

621489481676 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is not an unprimeable number, because it can be changed into a prime (621489481673) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 193669160 + ... + 193672368.

It is an arithmetic number, because the mean of its divisors is an integer number (7118496000).

Almost surely, 2^621489481676 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 621489481676, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (683375616000).

621489481676 is an abundant number, since it is smaller than the sum of its proper divisors (745261750324).

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

621489481676 is a wasteful number, since it uses less digits than its factorization.

621489481676 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3472 (or 3470 counting only the distinct ones).

The product of its digits is 27869184, while the sum is 62.

The spelling of 621489481676 in words is "six hundred twenty-one billion, four hundred eighty-nine million, four hundred eighty-one thousand, six hundred seventy-six".