720803387 has 4 divisors (see below), whose sum is σ = 730677480. Its totient is φ = 710929296.

The previous prime is 720803357. The next prime is 720803393. The reversal of 720803387 is 783308027.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 783308027 = 14033 ⋅55819.

It is a cyclic number.

It is not a de Polignac number, because 720803387 - 2⁸ = 720803131 is a prime.

It is a super-3 number, since 3×720803387³ (a number of 28 digits) contains 333 as substring.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 720803387.

It is not an unprimeable number, because it can be changed into a prime (720803357) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4936937 + ... + 4937082.

It is an arithmetic number, because the mean of its divisors is an integer number (182669370).

Almost surely, 2^720803387 is an apocalyptic number.

720803387 is a deficient number, since it is larger than the sum of its proper divisors (9874093).

720803387 is an equidigital number, since it uses as much as digits as its factorization.

720803387 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9874092.

The product of its (nonzero) digits is 56448, while the sum is 38.

The square root of 720803387 is about 26847.7817891907. The cubic root of 720803387 is about 896.6141867238.

The spelling of 720803387 in words is "seven hundred twenty million, eight hundred three thousand, three hundred eighty-seven".