728477131 has 4 divisors (see below), whose sum is σ = 739349992. Its totient is φ = 717604272.

The previous prime is 728477093. The next prime is 728477159. The reversal of 728477131 is 131774827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 131774827 = 3821 ⋅34487.

It is a cyclic number.

It is not a de Polignac number, because 728477131 - 2⁷ = 728477003 is a prime.

It is a super-2 number, since 2×728477131² = 1061357860779982322, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728477231) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5436330 + ... + 5436463.

It is an arithmetic number, because the mean of its divisors is an integer number (184837498).

Almost surely, 2^728477131 is an apocalyptic number.

728477131 is a deficient number, since it is larger than the sum of its proper divisors (10872861).

728477131 is a wasteful number, since it uses less digits than its factorization.

728477131 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10872860.

The product of its digits is 65856, while the sum is 40.

The square root of 728477131 is about 26990.3155038988. The cubic root of 728477131 is about 899.7847761080.

The spelling of 728477131 in words is "seven hundred twenty-eight million, four hundred seventy-seven thousand, one hundred thirty-one".