728458778488 has 32 divisors (see below), whose sum is σ = 1569071115360. Its totient is φ = 310579015680.

The previous prime is 728458778473. The next prime is 728458778609. The reversal of 728458778488 is 884877854827.

It is a super-2 number, since 2×728458778488² (a number of 25 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (76) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 33689173 + ... + 33710788.

It is an arithmetic number, because the mean of its divisors is an integer number (49033472355).

Almost surely, 2^728458778488 is an apocalyptic number.

It is an amenable number.

728458778488 is an abundant number, since it is smaller than the sum of its proper divisors (840612336872).

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

728458778488 is a wasteful number, since it uses less digits than its factorization.

728458778488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67400167 (or 67400163 counting only the distinct ones).

The product of its digits is 1798307840, while the sum is 76.

The spelling of 728458778488 in words is "seven hundred twenty-eight billion, four hundred fifty-eight million, seven hundred seventy-eight thousand, four hundred eighty-eight".