728217669 has 8 divisors (see below), whose sum is σ = 981866880. Its totient is φ = 480023456.

The previous prime is 728217649. The next prime is 728217689. The reversal of 728217669 is 966712827.

It is an interprime number because it is at equal distance from previous prime (728217649) and next prime (728217689).

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

It is a cyclic number.

It is not a de Polignac number, because 728217669 - 2¹² = 728213573 is a prime.

It is a super-2 number, since 2×728217669² = 1060601946887587122, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728217629) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1363437 + ... + 1363970.

It is an arithmetic number, because the mean of its divisors is an integer number (122733360).

Almost surely, 2^728217669 is an apocalyptic number.

It is an amenable number.

728217669 is a deficient number, since it is larger than the sum of its proper divisors (253649211).

728217669 is a wasteful number, since it uses less digits than its factorization.

728217669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2727499.

The product of its digits is 508032, while the sum is 48.

The square root of 728217669 is about 26985.5084999338. The cubic root of 728217669 is about 899.6779378512.

The spelling of 728217669 in words is "seven hundred twenty-eight million, two hundred seventeen thousand, six hundred sixty-nine".