621541428508 has 144 divisors (see below), whose sum is σ = 1519068418560. Its totient is φ = 215822880000.

The previous prime is 621541428491. The next prime is 621541428523. The reversal of 621541428508 is 805824145126.

It is a congruent number.

It is an unprimeable number.

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 47 ways as a sum of consecutive naturals, for example, 1303633 + ... + 1715383.

It is an arithmetic number, because the mean of its divisors is an integer number (10549086240).

Almost surely, 2^621541428508 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 621541428508, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (759534209280).

621541428508 is an abundant number, since it is smaller than the sum of its proper divisors (897526990052).

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

621541428508 is a wasteful number, since it uses less digits than its factorization.

621541428508 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 411828 (or 411813 counting only the distinct ones).

The product of its (nonzero) digits is 614400, while the sum is 46.

The spelling of 621541428508 in words is "six hundred twenty-one billion, five hundred forty-one million, four hundred twenty-eight thousand, five hundred eight".