12730721730 has 32 divisors (see below), whose sum is σ = 30562126848. Its totient is φ = 3393926400.

The previous prime is 12730721701. The next prime is 12730721761. The reversal of 12730721730 is 3712703721.

It is a junction number, because it is equal to n+sod(n) for n = 12730721691 and 12730721700.

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, 56415 + ... + 169245.

It is an arithmetic number, because the mean of its divisors is an integer number (955066464).

Almost surely, 2^12730721730 is an apocalyptic number.

12730721730 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a pronic number, being equal to 112830×112831.

12730721730 is an abundant number, since it is smaller than the sum of its proper divisors (17831405118).

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

12730721730 is a wasteful number, since it uses less digits than its factorization.

12730721730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116602.

The product of its (nonzero) digits is 12348, while the sum is 33.

The spelling of 12730721730 in words is "twelve billion, seven hundred thirty million, seven hundred twenty-one thousand, seven hundred thirty".