505990401528 has 64 divisors (see below), whose sum is σ = 1293612779520. Its totient is φ = 164854800000.

The previous prime is 505990401503. The next prime is 505990401529. The reversal of 505990401528 is 825104099505.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505990401529) by changing a digit.

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, 548478 + ... + 1145778.

It is an arithmetic number, because the mean of its divisors is an integer number (20212699680).

Almost surely, 2^505990401528 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 505990401528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (646806389760).

505990401528 is an abundant number, since it is smaller than the sum of its proper divisors (787622377992).

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

505990401528 is a wasteful number, since it uses less digits than its factorization.

505990401528 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 598108 (or 598104 counting only the distinct ones).

The product of its (nonzero) digits is 648000, while the sum is 48.

The spelling of 505990401528 in words is "five hundred five billion, nine hundred ninety million, four hundred one thousand, five hundred twenty-eight".