728725033 has 4 divisors (see below), whose sum is σ = 729390420. Its totient is φ = 728059648.

The previous prime is 728724991. The next prime is 728725051. The reversal of 728725033 is 330527827.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 330527827 = 7 ⋅47218261.

It can be written as a sum of positive squares in 2 ways, for example, as 552579049 + 176145984 = 23507^2 + 13272^2 .

It is a cyclic number.

It is not a de Polignac number, because 728725033 - 2²⁵ = 695170601 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 728724983 and 728725001.

It is not an unprimeable number, because it can be changed into a prime (728725133) 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, 331048 + ... + 333241.

It is an arithmetic number, because the mean of its divisors is an integer number (182347605).

Almost surely, 2^728725033 is an apocalyptic number.

It is an amenable number.

728725033 is a deficient number, since it is larger than the sum of its proper divisors (665387).

728725033 is a wasteful number, since it uses less digits than its factorization.

728725033 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 665386.

The product of its (nonzero) digits is 70560, while the sum is 37.

The square root of 728725033 is about 26994.9075382747. The cubic root of 728725033 is about 899.8868306262.

The spelling of 728725033 in words is "seven hundred twenty-eight million, seven hundred twenty-five thousand, thirty-three".