1647220007640 has 64 divisors (see below), whose sum is σ = 4941752256000. Its totient is φ = 439250470272.

The previous prime is 1647220007633. The next prime is 1647220007659. The reversal of 1647220007640 is 467000227461.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9066411 + ... + 9246309.

It is an arithmetic number, because the mean of its divisors is an integer number (77214879000).

Almost surely, 2^{1647220007640} is an apocalyptic number.

1647220007640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1647220007640 is an abundant number, since it is smaller than the sum of its proper divisors (3294532248360).

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

1647220007640 is a wasteful number, since it uses less digits than its factorization.

1647220007640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 256216 (or 256212 counting only the distinct ones).

The product of its (nonzero) digits is 112896, while the sum is 39.

The spelling of 1647220007640 in words is "one trillion, six hundred forty-seven billion, two hundred twenty million, seven thousand, six hundred forty".