621812878848 has 640 divisors, whose sum is σ = 2174325120000. Its totient is φ = 177551087616.

The previous prime is 621812878847. The next prime is 621812878859. The reversal of 621812878848 is 848878218126.

621812878848 is a `hidden beast` number, since 62 + 181 + 287 + 88 + 48 = 666.

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

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621812878847) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 384071383 + ... + 384073001.

It is an arithmetic number, because the mean of its divisors is an integer number (3397383000).

Almost surely, 2^621812878848 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 621812878848, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1087162560000).

621812878848 is an abundant number, since it is smaller than the sum of its proper divisors (1552512241152).

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

621812878848 is an frugal number, since it uses more digits than its factorization.

621812878848 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1679 (or 1631 counting only the distinct ones).

The product of its digits is 22020096, while the sum is 63.

The spelling of 621812878848 in words is "six hundred twenty-one billion, eight hundred twelve million, eight hundred seventy-eight thousand, eight hundred forty-eight".