1272812038644 has 24 divisors (see below), whose sum is σ = 2969913195648. Its totient is φ = 424268045440.

The previous prime is 1272812038637. The next prime is 1272812038657. The reversal of 1272812038644 is 4468302182721.

It is a junction number, because it is equal to n+sod(n) for n = 1272812038593 and 1272812038602.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3180949 + ... + 3558659.

It is an arithmetic number, because the mean of its divisors is an integer number (123746383152).

Almost surely, 2^{1272812038644} is an apocalyptic number.

It is an amenable number.

1272812038644 is an abundant number, since it is smaller than the sum of its proper divisors (1697101157004).

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

1272812038644 is a wasteful number, since it uses less digits than its factorization.

1272812038644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 658535 (or 658533 counting only the distinct ones).

The product of its (nonzero) digits is 1032192, while the sum is 48.

The spelling of 1272812038644 in words is "one trillion, two hundred seventy-two billion, eight hundred twelve million, thirty-eight thousand, six hundred forty-four".