728476661 has 8 divisors (see below), whose sum is σ = 796100448. Its totient is φ = 661086000.

The previous prime is 728476649. The next prime is 728476687. The reversal of 728476661 is 166674827.

It is a happy number.

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 728476661 - 2¹⁴ = 728460277 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (728476601) 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, 51710 + ... + 64271.

It is an arithmetic number, because the mean of its divisors is an integer number (99512556).

Almost surely, 2^728476661 is an apocalyptic number.

It is an amenable number.

728476661 is a deficient number, since it is larger than the sum of its proper divisors (67623787).

728476661 is a wasteful number, since it uses less digits than its factorization.

728476661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 116563.

The product of its digits is 677376, while the sum is 47.

The square root of 728476661 is about 26990.3067970707. The cubic root of 728476661 is about 899.7845825998.

It can be divided in two parts, 7284766 and 61, that added together give a palindrome (7284827).

The spelling of 728476661 in words is "seven hundred twenty-eight million, four hundred seventy-six thousand, six hundred sixty-one".