728633025666 has 128 divisors (see below), whose sum is σ = 2097729177600. Its totient is φ = 182052878400.

The previous prime is 728633025581. The next prime is 728633025667. The reversal of 728633025666 is 666520336827.

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

It is not an unprimeable number, because it can be changed into a prime (728633025667) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 3808660 + ... + 3995391.

It is an arithmetic number, because the mean of its divisors is an integer number (16388509200).

Almost surely, 2^728633025666 is an apocalyptic number.

728633025666 is an abundant number, since it is smaller than the sum of its proper divisors (1369096151934).

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

728633025666 is a wasteful number, since it uses less digits than its factorization.

728633025666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7804101 (or 7804095 counting only the distinct ones).

The product of its (nonzero) digits is 13063680, while the sum is 54.

The spelling of 728633025666 in words is "seven hundred twenty-eight billion, six hundred thirty-three million, twenty-five thousand, six hundred sixty-six".