621689064 has 64 divisors (see below), whose sum is σ = 1602218880. Its totient is φ = 200928000.

The previous prime is 621689053. The next prime is 621689093. The reversal of 621689064 is 460986126.

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 15 ways as a sum of consecutive naturals, for example, 100954 + ... + 106934.

It is an arithmetic number, because the mean of its divisors is an integer number (25034670).

Almost surely, 2^621689064 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 621689064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (801109440).

621689064 is an abundant number, since it is smaller than the sum of its proper divisors (980529816).

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

621689064 is a wasteful number, since it uses less digits than its factorization.

621689064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6122 (or 6118 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 42.

The square root of 621689064 is about 24933.6933485595. The cubic root of 621689064 is about 853.4755338923.

The spelling of 621689064 in words is "six hundred twenty-one million, six hundred eighty-nine thousand, sixty-four".