725761 has 4 divisors (see below), whose sum is σ = 728532. Its totient is φ = 722992.

The previous prime is 725749. The next prime is 725789. The reversal of 725761 is 167527.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 167527 = 233 ⋅719.

It can be written as a sum of positive squares in 2 ways, for example, as 553536 + 172225 = 744^2 + 415^2 .

It is a cyclic number.

It is not a de Polignac number, because 725761 - 2¹⁹ = 201473 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (725731) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 946 + ... + 1531.

It is an arithmetic number, because the mean of its divisors is an integer number (182133).

2⁷²⁵⁷⁶¹ is an apocalyptic number.

It is an amenable number.

725761 is a deficient number, since it is larger than the sum of its proper divisors (2771).

725761 is a wasteful number, since it uses less digits than its factorization.

725761 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2770.

The product of its digits is 2940, while the sum is 28.

The square root of 725761 is about 851.9160756788. The cubic root of 725761 is about 89.8665099213.

The spelling of 725761 in words is "seven hundred twenty-five thousand, seven hundred sixty-one".