720136 has 8 divisors (see below), whose sum is σ = 1350270. Its totient is φ = 360064.

The previous prime is 720133. The next prime is 720151. The reversal of 720136 is 631027.

720136 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., 476100 + 244036 = 690^2 + 494^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (19) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (720133) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 45001 + ... + 45016.

2⁷²⁰¹³⁶ is an apocalyptic number.

It is an amenable number.

720136 is a deficient number, since it is larger than the sum of its proper divisors (630134).

720136 is a wasteful number, since it uses less digits than its factorization.

720136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 90023 (or 90019 counting only the distinct ones).

The product of its (nonzero) digits is 252, while the sum is 19.

The square root of 720136 is about 848.6082724084. The cubic root of 720136 is about 89.6337378263.

The spelling of 720136 in words is "seven hundred twenty thousand, one hundred thirty-six".