1212309046728 has 512 divisors, whose sum is σ = 3807276480000. Its totient is φ = 356970571776.

The previous prime is 1212309046693. The next prime is 1212309046763. The reversal of 1212309046728 is 8276409032121.

It is an interprime number because it is at equal distance from previous prime (1212309046693) and next prime (1212309046763).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1885394775 + ... + 1885395417.

It is an arithmetic number, because the mean of its divisors is an integer number (7436086875).

Almost surely, 2^{1212309046728} is an apocalyptic number.

1212309046728 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1212309046728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1903638240000).

1212309046728 is an abundant number, since it is smaller than the sum of its proper divisors (2594967433272).

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

1212309046728 is a wasteful number, since it uses less digits than its factorization.

1212309046728 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 863 (or 827 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The spelling of 1212309046728 in words is "one trillion, two hundred twelve billion, three hundred nine million, forty-six thousand, seven hundred twenty-eight".