720869761 has 2 divisors, whose sum is σ = 720869762. Its totient is φ = 720869760.

The previous prime is 720869719. The next prime is 720869777. The reversal of 720869761 is 167968027.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 706762225 + 14107536 = 26585^2 + 3756^2 .

It is a cyclic number.

It is not a de Polignac number, because 720869761 - 2⁹ = 720869249 is a prime.

It is not a weakly prime, because it can be changed into another prime (720869711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360434880 + 360434881.

It is an arithmetic number, because the mean of its divisors is an integer number (360434881).

Almost surely, 2^720869761 is an apocalyptic number.

It is an amenable number.

720869761 is a deficient number, since it is larger than the sum of its proper divisors (1).

720869761 is an equidigital number, since it uses as much as digits as its factorization.

720869761 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 254016, while the sum is 46.

The square root of 720869761 is about 26849.0178777549. The cubic root of 720869761 is about 896.6417069624.

The spelling of 720869761 in words is "seven hundred twenty million, eight hundred sixty-nine thousand, seven hundred sixty-one".