1644712727670 has 128 divisors (see below), whose sum is σ = 4647427332480. Its totient is φ = 412476641280.

The previous prime is 1644712727641. The next prime is 1644712727717. The reversal of 1644712727670 is 767272174461.

It is a happy number.

1644712727670 is a `hidden beast` number, since 1 + 6 + 447 + 127 + 2 + 7 + 6 + 70 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 5927764 + ... + 6199016.

It is an arithmetic number, because the mean of its divisors is an integer number (36308026035).

Almost surely, 2^{1644712727670} is an apocalyptic number.

1644712727670 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 1644712727670, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2323713666240).

1644712727670 is an abundant number, since it is smaller than the sum of its proper divisors (3002714604810).

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

1644712727670 is a wasteful number, since it uses less digits than its factorization.

1644712727670 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 272607 (or 272601 counting only the distinct ones).

The product of its (nonzero) digits is 5531904, while the sum is 54.

The spelling of 1644712727670 in words is "one trillion, six hundred forty-four billion, seven hundred twelve million, seven hundred twenty-seven thousand, six hundred seventy".