621661024 has 48 divisors (see below), whose sum is σ = 1263666096. Its totient is φ = 300851200.

The previous prime is 621660989. The next prime is 621661031. The reversal of 621661024 is 420166126.

It is a junction number, because it is equal to n+sod(n) for n = 621660983 and 621661001.

It is a congruent number.

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 7 ways as a sum of consecutive naturals, for example, 170064 + ... + 173680.

It is an arithmetic number, because the mean of its divisors is an integer number (26326377).

Almost surely, 2^621661024 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 621661024, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (631833048).

621661024 is an abundant number, since it is smaller than the sum of its proper divisors (642005072).

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

621661024 is a wasteful number, since it uses less digits than its factorization.

621661024 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3799 (or 3791 counting only the distinct ones).

The product of its (nonzero) digits is 3456, while the sum is 28.

The square root of 621661024 is about 24933.1310508729. The cubic root of 621661024 is about 853.4627022828.

It can be divided in two parts, 62166 and 1024, that added together give a triangular number (63190 = T₃₅₅).

The spelling of 621661024 in words is "six hundred twenty-one million, six hundred sixty-one thousand, twenty-four".