728216722464 has 192 divisors, whose sum is σ = 2523446618112. Its totient is φ = 178020864000.

The previous prime is 728216722417. The next prime is 728216722577. The reversal of 728216722464 is 464227612827.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a nude number because it is divisible by every one of its digits.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 2771812 + ... + 3023139.

It is an arithmetic number, because the mean of its divisors is an integer number (13142951136).

Almost surely, 2^728216722464 is an apocalyptic number.

It is an amenable number.

728216722464 is an abundant number, since it is smaller than the sum of its proper divisors (1795229895648).

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

728216722464 is a wasteful number, since it uses less digits than its factorization.

728216722464 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5794999 (or 5794991 counting only the distinct ones).

The product of its digits is 3612672, while the sum is 51.

The spelling of 728216722464 in words is "seven hundred twenty-eight billion, two hundred sixteen million, seven hundred twenty-two thousand, four hundred sixty-four".