505840323870 has 160 divisors (see below), whose sum is σ = 1555981042176. Its totient is φ = 115507166400.

The previous prime is 505840323847. The next prime is 505840323871. The reversal of 505840323870 is 78323048505.

505840323870 is a `hidden beast` number, since 5 + 0 + 5 + 8 + 403 + 238 + 7 + 0 = 666.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (505840323871) by changing a digit.

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 79 ways as a sum of consecutive naturals, for example, 5802505 + ... + 5889035.

Almost surely, 2^505840323870 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 505840323870, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (777990521088).

505840323870 is an abundant number, since it is smaller than the sum of its proper divisors (1050140718306).

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

505840323870 is a wasteful number, since it uses less digits than its factorization.

505840323870 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87588 (or 87579 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 45.

The spelling of 505840323870 in words is "five hundred five billion, eight hundred forty million, three hundred twenty-three thousand, eight hundred seventy".