621384778980 has 432 divisors, whose sum is σ = 2236332309120. Its totient is φ = 139222250496.

The previous prime is 621384778943. The next prime is 621384779003. The reversal of 621384778980 is 89877483126.

621384778980 is a `hidden beast` number, since 6 + 2 + 1 + 3 + 8 + 477 + 89 + 80 = 666.

It is a super-2 number, since 2×621384778980² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is an unprimeable number.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 107521731 + ... + 107527509.

It is an arithmetic number, because the mean of its divisors is an integer number (5176695160).

Almost surely, 2^621384778980 is an apocalyptic number.

621384778980 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 621384778980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1118166154560).

621384778980 is an abundant number, since it is smaller than the sum of its proper divisors (1614947530140).

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

621384778980 is a wasteful number, since it uses less digits than its factorization.

621384778980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6048 (or 6036 counting only the distinct ones).

The product of its (nonzero) digits is 32514048, while the sum is 63.

The spelling of 621384778980 in words is "six hundred twenty-one billion, three hundred eighty-four million, seven hundred seventy-eight thousand, nine hundred eighty".