725246657 has 8 divisors (see below), whose sum is σ = 745799400. Its totient is φ = 704744064.

The previous prime is 725246633. The next prime is 725246693. The reversal of 725246657 is 756642527.

It can be written as a sum of positive squares in 4 ways, for example, as 239661361 + 485585296 = 15481^2 + 22036^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-725246657 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725246957) 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, 17819 + ... + 42047.

It is an arithmetic number, because the mean of its divisors is an integer number (93224925).

Almost surely, 2^725246657 is an apocalyptic number.

It is an amenable number.

725246657 is a deficient number, since it is larger than the sum of its proper divisors (20552743).

725246657 is a wasteful number, since it uses less digits than its factorization.

725246657 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25075.

The product of its digits is 705600, while the sum is 44.

The square root of 725246657 is about 26930.4039516677. The cubic root of 725246657 is about 898.4527559675.

The spelling of 725246657 in words is "seven hundred twenty-five million, two hundred forty-six thousand, six hundred fifty-seven".