620521021999040 has 112 divisors (see below), whose sum is σ = 1492304950461600. Its totient is φ = 245741116108800.

The previous prime is 620521021999033. The next prime is 620521021999103. The reversal of 620521021999040 is 40999120125026.

It is a self number, because there is not a number n which added to its sum of digits gives 620521021999040.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 840047786 + ... + 840786134.

Almost surely, 2^{620521021999040} 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 620521021999040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (746152475230800).

620521021999040 is an abundant number, since it is smaller than the sum of its proper divisors (871783928462560).

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

620521021999040 is a wasteful number, since it uses less digits than its factorization.

620521021999040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 764470 (or 764460 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 50.

The spelling of 620521021999040 in words is "six hundred twenty trillion, five hundred twenty-one billion, twenty-one million, nine hundred ninety-nine thousand, forty".