720505136 has 120 divisors (see below), whose sum is σ = 1587804624. Its totient is φ = 316293120.

The previous prime is 720505133. The next prime is 720505141. The reversal of 720505136 is 631505027.

It is a junction number, because it is equal to n+sod(n) for n = 720505099 and 720505108.

It is not an unprimeable number, because it can be changed into a prime (720505133) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7427840 + ... + 7427936.

Almost surely, 2^720505136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 720505136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (793902312).

720505136 is an abundant number, since it is smaller than the sum of its proper divisors (867299488).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

720505136 is a wasteful number, since it uses less digits than its factorization.

720505136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239 (or 220 counting only the distinct ones).

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 720505136 is about 26842.2267332649. The cubic root of 720505136 is about 896.4905039117.

The spelling of 720505136 in words is "seven hundred twenty million, five hundred five thousand, one hundred thirty-six".