505281393128 has 16 divisors (see below), whose sum is σ = 947412531780. Its totient is φ = 252638051328.

The previous prime is 505281393121. The next prime is 505281393137. The reversal of 505281393128 is 821393182505.

It can be written as a sum of positive squares in 2 ways, for example, as 475026965284 + 30254427844 = 689222^2 + 173938^2 .

It is not an unprimeable number, because it can be changed into a prime (505281393121) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 653450 + ... + 1198982.

Almost surely, 2^505281393128 is an apocalyptic number.

It is an amenable number.

505281393128 is a deficient number, since it is larger than the sum of its proper divisors (442131138652).

505281393128 is a wasteful number, since it uses less digits than its factorization.

505281393128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 661316 (or 661312 counting only the distinct ones).

The product of its (nonzero) digits is 518400, while the sum is 47.

The spelling of 505281393128 in words is "five hundred five billion, two hundred eighty-one million, three hundred ninety-three thousand, one hundred twenty-eight".