135720436 has 6 divisors (see below), whose sum is σ = 237510770. Its totient is φ = 67860216.

The previous prime is 135720433. The next prime is 135720437. The reversal of 135720436 is 634027531.

It can be written as a sum of positive squares in only one way, i.e., 134420836 + 1299600 = 11594^2 + 1140^2 .

It is a junction number, because it is equal to n+sod(n) for n = 135720398 and 135720407.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (135720433) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16965051 + ... + 16965058.

Almost surely, 2^135720436 is an apocalyptic number.

It is an amenable number.

135720436 is a deficient number, since it is larger than the sum of its proper divisors (101790334).

135720436 is a wasteful number, since it uses less digits than its factorization.

135720436 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33930113 (or 33930111 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 31.

The square root of 135720436 is about 11649.9114159722. The cubic root of 135720436 is about 513.9037049543.

Adding to 135720436 its reverse (634027531), we get a palindrome (769747967).

The spelling of 135720436 in words is "one hundred thirty-five million, seven hundred twenty thousand, four hundred thirty-six".