720807771 has 8 divisors (see below), whose sum is σ = 973242880. Its totient is φ = 474455592.

The previous prime is 720807749. The next prime is 720807799. The reversal of 720807771 is 177708027.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 720807771 - 2²² = 716613467 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (720807671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1520455 + ... + 1520928.

It is an arithmetic number, because the mean of its divisors is an integer number (121655360).

Almost surely, 2^720807771 is an apocalyptic number.

720807771 is a deficient number, since it is larger than the sum of its proper divisors (252435109).

720807771 is a wasteful number, since it uses less digits than its factorization.

720807771 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3041465.

The product of its (nonzero) digits is 38416, while the sum is 39.

The square root of 720807771 is about 26847.8634345454. The cubic root of 720807771 is about 896.6160044866.

The spelling of 720807771 in words is "seven hundred twenty million, eight hundred seven thousand, seven hundred seventy-one".