720642499 has 2 divisors, whose sum is σ = 720642500. Its totient is φ = 720642498.

The previous prime is 720642497. The next prime is 720642551. The reversal of 720642499 is 994246027.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 720642499 - 2¹ = 720642497 is a prime.

It is a super-2 number, since 2×720642499² = 1038651222729930002, which contains 22 as substring.

Together with 720642497, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (720642497) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 360321249 + 360321250.

It is an arithmetic number, because the mean of its divisors is an integer number (360321250).

Almost surely, 2^720642499 is an apocalyptic number.

720642499 is a deficient number, since it is larger than the sum of its proper divisors (1).

720642499 is an equidigital number, since it uses as much as digits as its factorization.

720642499 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 217728, while the sum is 43.

The square root of 720642499 is about 26844.7853222930. The cubic root of 720642499 is about 896.5474717222.

The spelling of 720642499 in words is "seven hundred twenty million, six hundred forty-two thousand, four hundred ninety-nine".