728394166690 has 8 divisors (see below), whose sum is σ = 1311109500060. Its totient is φ = 291357666672.

The previous prime is 728394166649. The next prime is 728394166693. The reversal of 728394166690 is 96661493827.

It can be written as a sum of positive squares in 2 ways, for example, as 713580599169 + 14813567521 = 844737^2 + 121711^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×728394166690² (a number of 25 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (728394166693) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 36419708325 + ... + 36419708344.

Almost surely, 2^728394166690 is an apocalyptic number.

728394166690 is a deficient number, since it is larger than the sum of its proper divisors (582715333370).

728394166690 is a wasteful number, since it uses less digits than its factorization.

728394166690 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72839416676.

The product of its (nonzero) digits is 23514624, while the sum is 61.

The spelling of 728394166690 in words is "seven hundred twenty-eight billion, three hundred ninety-four million, one hundred sixty-six thousand, six hundred ninety".