721128029464 has 16 divisors (see below), whose sum is σ = 1355645387520. Its totient is φ = 359622592800.

The previous prime is 721128029387. The next prime is 721128029509. The reversal of 721128029464 is 464920821127.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117674487 + ... + 117680614.

It is an arithmetic number, because the mean of its divisors is an integer number (84727836720).

Almost surely, 2^721128029464 is an apocalyptic number.

It is an amenable number.

721128029464 is a deficient number, since it is larger than the sum of its proper divisors (634517358056).

721128029464 is a wasteful number, since it uses less digits than its factorization.

721128029464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235355490 (or 235355486 counting only the distinct ones).

The product of its (nonzero) digits is 387072, while the sum is 46.

The spelling of 721128029464 in words is "seven hundred twenty-one billion, one hundred twenty-eight million, twenty-nine thousand, four hundred sixty-four".