619638840020 has 24 divisors (see below), whose sum is σ = 1314125148168. Its totient is φ = 245401520000.

The previous prime is 619638839927. The next prime is 619638840053. The reversal of 619638840020 is 20048836916.

It can be written as a sum of positive squares in 4 ways, for example, as 30287833156 + 589351006864 = 174034^2 + 767692^2 .

It is a super-2 number, since 2×619638840020² (a number of 24 digits) contains 22 as substring.

It is a congruent 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, 153373931 + ... + 153377970.

It is an arithmetic number, because the mean of its divisors is an integer number (54755214507).

Almost surely, 2^619638840020 is an apocalyptic number.

It is an amenable number.

619638840020 is an abundant number, since it is smaller than the sum of its proper divisors (694486308148).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

619638840020 is a wasteful number, since it uses less digits than its factorization.

619638840020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306752011 (or 306752009 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 47.

The spelling of 619638840020 in words is "six hundred nineteen billion, six hundred thirty-eight million, eight hundred forty thousand, twenty".