725403617 has 4 divisors (see below), whose sum is σ = 768074436. Its totient is φ = 682732800.

The previous prime is 725403607. The next prime is 725403619. The reversal of 725403617 is 716304527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 716304527 = 3881 ⋅184567.

It can be written as a sum of positive squares in 2 ways, for example, as 411440656 + 313962961 = 20284^2 + 17719^2 .

It is a cyclic number.

It is not a de Polignac number, because 725403617 - 2¹⁰ = 725402593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725403619) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21335384 + ... + 21335417.

It is an arithmetic number, because the mean of its divisors is an integer number (192018609).

Almost surely, 2^725403617 is an apocalyptic number.

It is an amenable number.

725403617 is a deficient number, since it is larger than the sum of its proper divisors (42670819).

725403617 is a wasteful number, since it uses less digits than its factorization.

725403617 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42670818.

The product of its (nonzero) digits is 35280, while the sum is 35.

The square root of 725403617 is about 26933.3179723554. The cubic root of 725403617 is about 898.5175665488.

The spelling of 725403617 in words is "seven hundred twenty-five million, four hundred three thousand, six hundred seventeen".