720405535 has 4 divisors (see below), whose sum is σ = 864486648. Its totient is φ = 576324424.

The previous prime is 720405523. The next prime is 720405541. The reversal of 720405535 is 535504027.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 720405535 - 2⁷ = 720405407 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 720405497 and 720405506.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 72040549 + ... + 72040558.

It is an arithmetic number, because the mean of its divisors is an integer number (216121662).

Almost surely, 2^720405535 is an apocalyptic number.

720405535 is a deficient number, since it is larger than the sum of its proper divisors (144081113).

720405535 is a wasteful number, since it uses less digits than its factorization.

720405535 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 144081112.

The product of its (nonzero) digits is 21000, while the sum is 31.

The square root of 720405535 is about 26840.3713647930. The cubic root of 720405535 is about 896.4491924016.

The spelling of 720405535 in words is "seven hundred twenty million, four hundred five thousand, five hundred thirty-five".