505172872 has 8 divisors (see below), whose sum is σ = 947199150. Its totient is φ = 252586432.

The previous prime is 505172861. The next prime is 505172879. The reversal of 505172872 is 278271505.

It can be written as a sum of positive squares in only one way, i.e., 441588196 + 63584676 = 21014^2 + 7974^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (37) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (505172879) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31573297 + ... + 31573312.

Almost surely, 2^505172872 is an apocalyptic number.

It is an amenable number.

505172872 is a deficient number, since it is larger than the sum of its proper divisors (442026278).

505172872 is a wasteful number, since it uses less digits than its factorization.

505172872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63146615 (or 63146611 counting only the distinct ones).

The product of its (nonzero) digits is 39200, while the sum is 37.

The square root of 505172872 is about 22476.0510766460. The cubic root of 505172872 is about 796.4282814315.

The spelling of 505172872 in words is "five hundred five million, one hundred seventy-two thousand, eight hundred seventy-two".