1728666489402 has 48 divisors (see below), whose sum is σ = 3866955106560. Its totient is φ = 557534793600.

The previous prime is 1728666489397. The next prime is 1728666489413. The reversal of 1728666489402 is 2049846668271.

It is a self number, because there is not a number n which added to its sum of digits gives 1728666489402.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2884002 + ... + 3431442.

It is an arithmetic number, because the mean of its divisors is an integer number (80561564720).

Almost surely, 2^{1728666489402} is an apocalyptic number.

1728666489402 is an abundant number, since it is smaller than the sum of its proper divisors (2138288617158).

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

1728666489402 is a wasteful number, since it uses less digits than its factorization.

1728666489402 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 553139 (or 553136 counting only the distinct ones).

The product of its (nonzero) digits is 55738368, while the sum is 63.

The spelling of 1728666489402 in words is "one trillion, seven hundred twenty-eight billion, six hundred sixty-six million, four hundred eighty-nine thousand, four hundred two".