720691487 has 2 divisors, whose sum is σ = 720691488. Its totient is φ = 720691486.

The previous prime is 720691471. The next prime is 720691493. The reversal of 720691487 is 784196027.

It is a strong prime.

It is an emirp because it is prime and its reverse (784196027) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 720691487 - 2⁴ = 720691471 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (720691427) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360345743 + 360345744.

It is an arithmetic number, because the mean of its divisors is an integer number (360345744).

Almost surely, 2^720691487 is an apocalyptic number.

720691487 is a deficient number, since it is larger than the sum of its proper divisors (1).

720691487 is an equidigital number, since it uses as much as digits as its factorization.

720691487 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 169344, while the sum is 44.

The square root of 720691487 is about 26845.6977372539. The cubic root of 720691487 is about 896.5677864980.

The spelling of 720691487 in words is "seven hundred twenty million, six hundred ninety-one thousand, four hundred eighty-seven".