15728240 has 80 divisors (see below), whose sum is σ = 40684896. Its totient is φ = 5606400.

The previous prime is 15728233. The next prime is 15728243. The reversal of 15728240 is 4282751.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15728243) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 53534 + ... + 53826.

Almost surely, 2^15728240 is an apocalyptic number.

15728240 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 15728240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20342448).

15728240 is an abundant number, since it is smaller than the sum of its proper divisors (24956656).

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

15728240 is a wasteful number, since it uses less digits than its factorization.

15728240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 378 (or 372 counting only the distinct ones).

The product of its (nonzero) digits is 4480, while the sum is 29.

The square root of 15728240 is about 3965.8845167251. The cubic root of 15728240 is about 250.5494050652.

The spelling of 15728240 in words is "fifteen million, seven hundred twenty-eight thousand, two hundred forty".