728640622612 has 60 divisors (see below), whose sum is σ = 1502890274900. Its totient is φ = 309054832128.

The previous prime is 728640622609. The next prime is 728640622613. The reversal of 728640622612 is 216226046827.

It can be written as a sum of positive squares in 2 ways, for example, as 566171973136 + 162468649476 = 752444^2 + 403074^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728640622613) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 540514 + ... + 1322662.

Almost surely, 2^728640622612 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 728640622612, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (751445137450).

728640622612 is an abundant number, since it is smaller than the sum of its proper divisors (774249652288).

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

728640622612 is an equidigital number, since it uses as much as digits as its factorization.

728640622612 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 782278 (or 782255 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 46.

The spelling of 728640622612 in words is "seven hundred twenty-eight billion, six hundred forty million, six hundred twenty-two thousand, six hundred twelve".