725239636 has 18 divisors (see below), whose sum is σ = 1395038330. Its totient is φ = 329654160.

The previous prime is 725239621. The next prime is 725239639. The reversal of 725239636 is 636932527.

725239636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in only one way, i.e., 665949636 + 59290000 = 25806^2 + 7700^2 .

It is a junction number, because it is equal to n+sod(n) for n = 725239592 and 725239601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (725239639) 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, 748731 + ... + 749698.

Almost surely, 2^725239636 is an apocalyptic number.

It is an amenable number.

725239636 is a deficient number, since it is larger than the sum of its proper divisors (669798694).

725239636 is a wasteful number, since it uses less digits than its factorization.

725239636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1498455 (or 1498442 counting only the distinct ones).

The product of its digits is 408240, while the sum is 43.

The square root of 725239636 is about 26930.2735968278. The cubic root of 725239636 is about 898.4498566977.

The spelling of 725239636 in words is "seven hundred twenty-five million, two hundred thirty-nine thousand, six hundred thirty-six".