15728239440 has 60 divisors (see below), whose sum is σ = 52820673204. Its totient is φ = 4194196992.

The previous prime is 15728239403. The next prime is 15728239487. The reversal of 15728239440 is 4493282751.

15728239440 is a `hidden beast` number, since 1 + 572 + 8 + 2 + 39 + 4 + 40 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 5630401296 + 10097838144 = 75036^2 + 100488^2 .

It is a tau number, because it is divible by the number of its divisors (60).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 10921669 + ... + 10923108.

Almost surely, 2^15728239440 is an apocalyptic number.

15728239440 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15728239440 is an abundant number, since it is smaller than the sum of its proper divisors (37092433764).

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

15728239440 is a wasteful number, since it uses less digits than its factorization.

15728239440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21844796 (or 21844787 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The spelling of 15728239440 in words is "fifteen billion, seven hundred twenty-eight million, two hundred thirty-nine thousand, four hundred forty".