728581001 has 4 divisors (see below), whose sum is σ = 728640000. Its totient is φ = 728522004.

The previous prime is 728580971. The next prime is 728581031. The reversal of 728581001 is 100185827.

It is a happy number.

728581001 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 100185827 = 7 ⋅14312261.

It is an interprime number because it is at equal distance from previous prime (728580971) and next prime (728581031).

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-728581001 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (728581031) 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, 3101 + ... + 38298.

It is an arithmetic number, because the mean of its divisors is an integer number (182160000).

Almost surely, 2^728581001 is an apocalyptic number.

It is an amenable number.

728581001 is a deficient number, since it is larger than the sum of its proper divisors (58999).

728581001 is a wasteful number, since it uses less digits than its factorization.

728581001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 58998.

The product of its (nonzero) digits is 4480, while the sum is 32.

The square root of 728581001 is about 26992.2396440162. The cubic root of 728581001 is about 899.8275393827.

The spelling of 728581001 in words is "seven hundred twenty-eight million, five hundred eighty-one thousand, one".