728791669 has 4 divisors (see below), whose sum is σ = 738016960. Its totient is φ = 719566380.

The previous prime is 728791667. The next prime is 728791697. The reversal of 728791669 is 966197827.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 728791669 - 2¹ = 728791667 is a prime.

It is a super-2 number, since 2×728791669² = 1062274593607611122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728791667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4612527 + ... + 4612684.

It is an arithmetic number, because the mean of its divisors is an integer number (184504240).

Almost surely, 2^728791669 is an apocalyptic number.

728791669 is a gapful number since it is divisible by the number (79) formed by its first and last digit.

It is an amenable number.

728791669 is a deficient number, since it is larger than the sum of its proper divisors (9225291).

728791669 is an equidigital number, since it uses as much as digits as its factorization.

728791669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9225290.

The product of its digits is 2286144, while the sum is 55.

The square root of 728791669 is about 26996.1417428491. The cubic root of 728791669 is about 899.9142589101.

The spelling of 728791669 in words is "seven hundred twenty-eight million, seven hundred ninety-one thousand, six hundred sixty-nine".