505280838078 has 80 divisors (see below), whose sum is σ = 1139442985296. Its totient is φ = 167351184000.

The previous prime is 505280838031. The next prime is 505280838109. The reversal of 505280838078 is 870838082505.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (54).

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 39 ways as a sum of consecutive naturals, for example, 56131578 + ... + 56140578.

Almost surely, 2^505280838078 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 505280838078, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (569721492648).

505280838078 is an abundant number, since it is smaller than the sum of its proper divisors (634162147218).

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

505280838078 is a wasteful number, since it uses less digits than its factorization.

505280838078 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11191 (or 11182 counting only the distinct ones).

The product of its (nonzero) digits is 4300800, while the sum is 54.

The spelling of 505280838078 in words is "five hundred five billion, two hundred eighty million, eight hundred thirty-eight thousand, seventy-eight".