15421688724 has 72 divisors (see below), whose sum is σ = 39329569440. Its totient is φ = 4700721792.

The previous prime is 15421688719. The next prime is 15421688731. The reversal of 15421688724 is 42788612451.

It is a happy number.

15421688724 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 181462 + ... + 252530.

It is an arithmetic number, because the mean of its divisors is an integer number (546244020).

Almost surely, 2^15421688724 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15421688724, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19664784720).

15421688724 is an abundant number, since it is smaller than the sum of its proper divisors (23907880716).

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

15421688724 is a wasteful number, since it uses less digits than its factorization.

15421688724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71209 (or 71194 counting only the distinct ones).

The product of its digits is 860160, while the sum is 48.

The spelling of 15421688724 in words is "fifteen billion, four hundred twenty-one million, six hundred eighty-eight thousand, seven hundred twenty-four".