621448146 has 64 divisors (see below), whose sum is σ = 1510876800. Its totient is φ = 187776000.

The previous prime is 621448099. The next prime is 621448151. The reversal of 621448146 is 641844126.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 621448146.

It is an unprimeable number.

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 31 ways as a sum of consecutive naturals, for example, 236890 + ... + 239498.

It is an arithmetic number, because the mean of its divisors is an integer number (23607450).

Almost surely, 2^621448146 is an apocalyptic number.

621448146 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 621448146, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (755438400).

621448146 is an abundant number, since it is smaller than the sum of its proper divisors (889428654).

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

621448146 is a wasteful number, since it uses less digits than its factorization.

621448146 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3032 (or 3026 counting only the distinct ones).

The product of its digits is 36864, while the sum is 36.

The square root of 621448146 is about 24928.8617068650. The cubic root of 621448146 is about 853.3652728863.

The spelling of 621448146 in words is "six hundred twenty-one million, four hundred forty-eight thousand, one hundred forty-six".