15240455440 has 80 divisors (see below), whose sum is σ = 40670218368. Its totient is φ = 5202828288.

The previous prime is 15240455429. The next prime is 15240455449. The reversal of 15240455440 is 4455404251.

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

It is a junction number, because it is equal to n+sod(n) for n = 15240455396 and 15240455405.

It is not an unprimeable number, because it can be changed into a prime (15240455449) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 72079 + ... + 188881.

Almost surely, 2^15240455440 is an apocalyptic number.

15240455440 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 15240455440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (20335109184).

15240455440 is an abundant number, since it is smaller than the sum of its proper divisors (25429762928).

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

15240455440 is a wasteful number, since it uses less digits than its factorization.

15240455440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 117056 (or 117050 counting only the distinct ones).

The product of its (nonzero) digits is 64000, while the sum is 34.

Adding to 15240455440 its reverse (4455404251), we get a palindrome (19695859691).

The spelling of 15240455440 in words is "fifteen billion, two hundred forty million, four hundred fifty-five thousand, four hundred forty".