• 725 can be written using four 4's:

725 has 6 divisors (see below), whose sum is σ = 930. Its totient is φ = 560.

The previous prime is 719. The next prime is 727. The reversal of 725 is 527.

725 is nontrivially palindromic in base 12.

It can be written as a sum of positive squares in 3 ways, for example, as 49 + 676 = 7^2 + 26^2 .

It is not a de Polignac number, because 725 - 2^{4} = 709 is a prime.

It is an alternating number because its digits alternate between odd and even.

725 is an undulating number in base 12.

It is a Curzon number.

It is a plaindrome in base 11, base 14 and base 15.

It is a nialpdrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (727) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11 + ... + 39.

It is an arithmetic number, because the mean of its divisors is an integer number (155).

It is an amenable number.

725 is a deficient number, since it is larger than the sum of its proper divisors (205).

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

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

The sum of its prime factors is 39 (or 34 counting only the distinct ones).

The product of its digits is 70, while the sum is 14.

The square root of 725 is about 26.9258240357. The cubic root of 725 is about 8.9835088957.

It can be divided in two parts, 72 and 5, that added together give a palindrome (77).

The spelling of 725 in words is "seven hundred twenty-five", and thus it is an aban number and an oban number.

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