619959985 has 8 divisors (see below), whose sum is σ = 747729576. Its totient is φ = 493449600.

The previous prime is 619959959. The next prime is 619959997. The reversal of 619959985 is 589959916.

It can be written as a sum of positive squares in 4 ways, for example, as 335329344 + 284630641 = 18312^2 + 16871^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 619959985 - 2⁵ = 619959953 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 313716 + ... + 315685.

It is an arithmetic number, because the mean of its divisors is an integer number (93466197).

Almost surely, 2^619959985 is an apocalyptic number.

It is an amenable number.

619959985 is a deficient number, since it is larger than the sum of its proper divisors (127769591).

619959985 is a wasteful number, since it uses less digits than its factorization.

619959985 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 629603.

The product of its digits is 7873200, while the sum is 61.

The square root of 619959985 is about 24898.9956624760. The cubic root of 619959985 is about 852.6835533816.

It can be divided in two parts, 619959 and 985, that added together give a square (620944 = 788²).

The spelling of 619959985 in words is "six hundred nineteen million, nine hundred fifty-nine thousand, nine hundred eighty-five".