505011978 has 12 divisors (see below), whose sum is σ = 1094192658. Its totient is φ = 168337320.

The previous prime is 505011953. The next prime is 505012021. The reversal of 505011978 is 879110505.

It can be written as a sum of positive squares in only one way, i.e., 447449409 + 57562569 = 21153^2 + 7587^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 14028093 + ... + 14028128.

Almost surely, 2^505011978 is an apocalyptic number.

505011978 is an abundant number, since it is smaller than the sum of its proper divisors (589180680).

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

505011978 is a wasteful number, since it uses less digits than its factorization.

505011978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28056229 (or 28056226 counting only the distinct ones).

The product of its (nonzero) digits is 12600, while the sum is 36.

The square root of 505011978 is about 22472.4715596661. The cubic root of 505011978 is about 796.3437201883.

The spelling of 505011978 in words is "five hundred five million, eleven thousand, nine hundred seventy-eight".