724987397128 has 8 divisors (see below), whose sum is σ = 1359351369630. Its totient is φ = 362493698560.

The previous prime is 724987397119. The next prime is 724987397201. The reversal of 724987397128 is 821793789427.

It can be written as a sum of positive squares in only one way, i.e., 589888513764 + 135098883364 = 768042^2 + 367558^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45311712313 + ... + 45311712328.

Almost surely, 2^724987397128 is an apocalyptic number.

It is an amenable number.

724987397128 is a deficient number, since it is larger than the sum of its proper divisors (634363972502).

724987397128 is a wasteful number, since it uses less digits than its factorization.

724987397128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90623424647 (or 90623424643 counting only the distinct ones).

The product of its digits is 85349376, while the sum is 67.

The spelling of 724987397128 in words is "seven hundred twenty-four billion, nine hundred eighty-seven million, three hundred ninety-seven thousand, one hundred twenty-eight".