172860228785 has 8 divisors (see below), whose sum is σ = 207533325480. Its totient is φ = 138220815744.

The previous prime is 172860228769. The next prime is 172860228791. The reversal of 172860228785 is 587822068271.

It can be written as a sum of positive squares in 4 ways, for example, as 183412849 + 172676815936 = 13543^2 + 415544^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 172860228785 - 2⁴ = 172860228769 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 172860228785.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8409620 + ... + 8430149.

It is an arithmetic number, because the mean of its divisors is an integer number (25941665685).

Almost surely, 2^172860228785 is an apocalyptic number.

It is an amenable number.

172860228785 is a deficient number, since it is larger than the sum of its proper divisors (34673096695).

172860228785 is a wasteful number, since it uses less digits than its factorization.

172860228785 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16841827.

The product of its (nonzero) digits is 6021120, while the sum is 56.

The spelling of 172860228785 in words is "one hundred seventy-two billion, eight hundred sixty million, two hundred twenty-eight thousand, seven hundred eighty-five".