12540729870 has 48 divisors (see below), whose sum is σ = 32636148480. Its totient is φ = 3341092032.

The previous prime is 12540729827. The next prime is 12540729907. The reversal of 12540729870 is 7892704521.

It is a happy number.

12540729870 is a `hidden beast` number, since 1 + 2 + 540 + 7 + 29 + 87 + 0 = 666.

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 pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 33736 + ... + 161924.

It is an arithmetic number, because the mean of its divisors is an integer number (679919760).

Almost surely, 2^12540729870 is an apocalyptic number.

12540729870 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

12540729870 is an abundant number, since it is smaller than the sum of its proper divisors (20095418610).

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

12540729870 is a wasteful number, since it uses less digits than its factorization.

12540729870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 129289 (or 129286 counting only the distinct ones).

The product of its (nonzero) digits is 282240, while the sum is 45.

The spelling of 12540729870 in words is "twelve billion, five hundred forty million, seven hundred twenty-nine thousand, eight hundred seventy".