620216999 has 4 divisors (see below), whose sum is σ = 620898720. Its totient is φ = 619535280.

The previous prime is 620216929. The next prime is 620217023. The reversal of 620216999 is 999612026.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-620216999 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (620216929) 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 in 3 ways as a sum of consecutive naturals, for example, 339494 + ... + 341315.

It is an arithmetic number, because the mean of its divisors is an integer number (155224680).

Almost surely, 2^620216999 is an apocalyptic number.

620216999 is a deficient number, since it is larger than the sum of its proper divisors (681721).

620216999 is an equidigital number, since it uses as much as digits as its factorization.

620216999 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 681720.

The product of its (nonzero) digits is 104976, while the sum is 44.

The square root of 620216999 is about 24904.1562595483. The cubic root of 620216999 is about 852.8013681540.

The spelling of 620216999 in words is "six hundred twenty million, two hundred sixteen thousand, nine hundred ninety-nine".