12728220401840 has 40 divisors (see below), whose sum is σ = 29733364191408. Its totient is φ = 5067158826240.

The previous prime is 12728220401837. The next prime is 12728220401857. The reversal of 12728220401840 is 4810402282721.

It is a tau number, because it is divible by the number of its divisors (40).

It is a super-2 number, since 2×12728220401840² (a number of 27 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 377003867 + ... + 377037626.

Almost surely, 2^{12728220401840} is an apocalyptic number.

12728220401840 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

12728220401840 is an abundant number, since it is smaller than the sum of its proper divisors (17005143789568).

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

12728220401840 is a wasteful number, since it uses less digits than its factorization.

12728220401840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 754041717 (or 754041711 counting only the distinct ones).

The product of its (nonzero) digits is 114688, while the sum is 41.

The spelling of 12728220401840 in words is "twelve trillion, seven hundred twenty-eight billion, two hundred twenty million, four hundred one thousand, eight hundred forty".