505991330 has 32 divisors (see below), whose sum is σ = 985824000. Its totient is φ = 185879232.

The previous prime is 505991327. The next prime is 505991347. The reversal of 505991330 is 33199505.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 16091 + ... + 35649.

It is an arithmetic number, because the mean of its divisors is an integer number (30807000).

Almost surely, 2^505991330 is an apocalyptic number.

505991330 is a deficient number, since it is larger than the sum of its proper divisors (479832670).

505991330 is a wasteful number, since it uses less digits than its factorization.

505991330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19778.

The product of its (nonzero) digits is 18225, while the sum is 35.

The square root of 505991330 is about 22494.2510433222. The cubic root of 505991330 is about 796.8581615922.

The spelling of 505991330 in words is "five hundred five million, nine hundred ninety-one thousand, three hundred thirty".