720619 has 2 divisors, whose sum is σ = 720620. Its totient is φ = 720618.

The previous prime is 720617. The next prime is 720653. The reversal of 720619 is 916027.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 720619 - 2¹ = 720617 is a prime.

It is a super-2 number, since 2×720619² = 1038583486322, which contains 22 as substring.

Together with 720617, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 720593 and 720602.

It is not a weakly prime, because it can be changed into another prime (720611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360309 + 360310.

It is an arithmetic number, because the mean of its divisors is an integer number (360310).

2⁷²⁰⁶¹⁹ is an apocalyptic number.

720619 is a deficient number, since it is larger than the sum of its proper divisors (1).

720619 is an equidigital number, since it uses as much as digits as its factorization.

720619 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 720619 is about 848.8928083097. The cubic root of 720619 is about 89.6537726623.

It can be divided in two parts, 7206 and 19, that added together give a square (7225 = 85²).

The spelling of 720619 in words is "seven hundred twenty thousand, six hundred nineteen".