15212063540 has 48 divisors (see below), whose sum is σ = 32743572624. Its totient is φ = 5932953600.

The previous prime is 15212063533. The next prime is 15212063549. The reversal of 15212063540 is 4536021251.

It can be written as a sum of positive squares in 8 ways, for example, as 3023020324 + 12189043216 = 54982^2 + 110404^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (15212063549) 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, 1748000 + ... + 1756680.

It is an arithmetic number, because the mean of its divisors is an integer number (682157763).

Almost surely, 2^15212063540 is an apocalyptic number.

15212063540 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

15212063540 is an abundant number, since it is smaller than the sum of its proper divisors (17531509084).

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

15212063540 is a wasteful number, since it uses less digits than its factorization.

15212063540 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10868 (or 10866 counting only the distinct ones).

The product of its (nonzero) digits is 7200, while the sum is 29.

Adding to 15212063540 its reverse (4536021251), we get a palindrome (19748084791).

The spelling of 15212063540 in words is "fifteen billion, two hundred twelve million, sixty-three thousand, five hundred forty".