2644428487680 has 1848 divisors, whose sum is σ = 11661356641680. Its totient is φ = 571875655680.

The previous prime is 2644428487667. The next prime is 2644428487787. The reversal of 2644428487680 is 867848244462.

2644428487680 is a `hidden beast` number, since 2 + 6 + 4 + 442 + 8 + 48 + 76 + 80 = 666.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 167 ways as a sum of consecutive naturals, for example, 3474938500 + ... + 3474939260.

Almost surely, 2^{2644428487680} is an apocalyptic number.

2644428487680 is a gapful number since it is divisible by the number (20) 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 2644428487680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (5830678320840).

2644428487680 is an abundant number, since it is smaller than the sum of its proper divisors (9016928154000).

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

2644428487680 is an equidigital number, since it uses as much as digits as its factorization.

2644428487680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 837 (or 797 counting only the distinct ones).

The product of its (nonzero) digits is 132120576, while the sum is 63.

The spelling of 2644428487680 in words is "two trillion, six hundred forty-four billion, four hundred twenty-eight million, four hundred eighty-seven thousand, six hundred eighty".