505691730 has 48 divisors (see below), whose sum is σ = 1324290240. Its totient is φ = 133877664.

The previous prime is 505691729. The next prime is 505691743. The reversal of 505691730 is 37196505.

It is a happy number.

505691730 is a `hidden beast` number, since 50 + 569 + 17 + 30 = 666.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7702 + ... + 32721.

It is an arithmetic number, because the mean of its divisors is an integer number (27589380).

Almost surely, 2^505691730 is an apocalyptic number.

505691730 is an abundant number, since it is smaller than the sum of its proper divisors (818598510).

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

505691730 is a wasteful number, since it uses less digits than its factorization.

505691730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40575 (or 40572 counting only the distinct ones).

The product of its (nonzero) digits is 28350, while the sum is 36.

The square root of 505691730 is about 22487.5905779165. The cubic root of 505691730 is about 796.7008559718.

The spelling of 505691730 in words is "five hundred five million, six hundred ninety-one thousand, seven hundred thirty".