619945920 has 336 divisors, whose sum is σ = 2407980960. Its totient is φ = 150036480.

The previous prime is 619945901. The next prime is 619945969. The reversal of 619945920 is 29549916.

619945920 is a `hidden beast` number, since 6 + 199 + 459 + 2 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1045144 + ... + 1045736.

It is an arithmetic number, because the mean of its divisors is an integer number (7166610).

Almost surely, 2^619945920 is an apocalyptic number.

619945920 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 619945920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1203990480).

619945920 is an abundant number, since it is smaller than the sum of its proper divisors (1788035040).

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

619945920 is a wasteful number, since it uses less digits than its factorization.

619945920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 641 (or 614 counting only the distinct ones).

The product of its (nonzero) digits is 174960, while the sum is 45.

The square root of 619945920 is about 24898.7132197630. The cubic root of 619945920 is about 852.6771050704.

The spelling of 619945920 in words is "six hundred nineteen million, nine hundred forty-five thousand, nine hundred twenty".