619920640 has 144 divisors (see below), whose sum is σ = 1624734720. Its totient is φ = 225607680.

The previous prime is 619920629. The next prime is 619920659. The reversal of 619920640 is 46029916.

It is a self number, because there is not a number n which added to its sum of digits gives 619920640.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 674101 + ... + 675019.

It is an arithmetic number, because the mean of its divisors is an integer number (11282880).

Almost surely, 2^619920640 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 619920640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (812367360).

619920640 is an abundant number, since it is smaller than the sum of its proper divisors (1004814080).

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

619920640 is a wasteful number, since it uses less digits than its factorization.

619920640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 988 (or 974 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 619920640 is about 24898.2055578309. The cubic root of 619920640 is about 852.6655148281.

The spelling of 619920640 in words is "six hundred nineteen million, nine hundred twenty thousand, six hundred forty".