724121121428 has 12 divisors (see below), whose sum is σ = 1341753842772. Its totient is φ = 340762880640.

The previous prime is 724121121407. The next prime is 724121121467. The reversal of 724121121428 is 824121121427.

724121121428 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 367917459844 + 356203661584 = 606562^2 + 596828^2 .

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, 5324419943 + ... + 5324420078.

It is an arithmetic number, because the mean of its divisors is an integer number (111812820231).

Almost surely, 2^724121121428 is an apocalyptic number.

It is an amenable number.

724121121428 is a deficient number, since it is larger than the sum of its proper divisors (617632721344).

724121121428 is a wasteful number, since it uses less digits than its factorization.

724121121428 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10648840042 (or 10648840040 counting only the distinct ones).

The product of its digits is 14336, while the sum is 35.

Subtracting 724121121428 from its reverse (824121121427), we obtain a palindrome (99999999999).

The spelling of 724121121428 in words is "seven hundred twenty-four billion, one hundred twenty-one million, one hundred twenty-one thousand, four hundred twenty-eight".