621800064 has 96 divisors (see below), whose sum is σ = 1855657440. Its totient is φ = 207256320.

The previous prime is 621800063. The next prime is 621800071. The reversal of 621800064 is 460008126.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (621800063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21109 + ... + 41099.

It is an arithmetic number, because the mean of its divisors is an integer number (19329765).

Almost surely, 2^621800064 is an apocalyptic number.

621800064 is a gapful number since it is divisible by the number (64) 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 621800064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (927828720).

621800064 is an abundant number, since it is smaller than the sum of its proper divisors (1233857376).

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

621800064 is an equidigital number, since it uses as much as digits as its factorization.

621800064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20020 (or 19996 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 27.

The square root of 621800064 is about 24935.9191529007. The cubic root of 621800064 is about 853.5263257066.

The spelling of 621800064 in words is "six hundred twenty-one million, eight hundred thousand, sixty-four".