720919636 has 24 divisors (see below), whose sum is σ = 1323846720. Its totient is φ = 342853632.

The previous prime is 720919631. The next prime is 720919651. The reversal of 720919636 is 636919027.

720919636 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 720919592 and 720919601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (720919631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 5421 + ... + 38356.

It is an arithmetic number, because the mean of its divisors is an integer number (55160280).

Almost surely, 2^720919636 is an apocalyptic number.

It is an amenable number.

720919636 is a deficient number, since it is larger than the sum of its proper divisors (602927084).

720919636 is a wasteful number, since it uses less digits than its factorization.

720919636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43983 (or 43981 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 720919636 is about 26849.9466666137. The cubic root of 720919636 is about 896.6623852116.

The spelling of 720919636 in words is "seven hundred twenty million, nine hundred nineteen thousand, six hundred thirty-six".