15321004540 has 48 divisors (see below), whose sum is σ = 34588108800. Its totient is φ = 5682318912.

The previous prime is 15321004519. The next prime is 15321004583. The reversal of 15321004540 is 4540012351.

It is a happy number.

It is a super-2 number, since 2×15321004540² (a number of 21 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 411060 + ... + 446779.

It is an arithmetic number, because the mean of its divisors is an integer number (720585600).

Almost surely, 2^15321004540 is an apocalyptic number.

15321004540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15321004540 is an abundant number, since it is smaller than the sum of its proper divisors (19267104260).

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

15321004540 is a wasteful number, since it uses less digits than its factorization.

15321004540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 857914 (or 857912 counting only the distinct ones).

The product of its (nonzero) digits is 2400, while the sum is 25.

Adding to 15321004540 its reverse (4540012351), we get a palindrome (19861016891).

The spelling of 15321004540 in words is "fifteen billion, three hundred twenty-one million, four thousand, five hundred forty".