321780085 has 16 divisors (see below), whose sum is σ = 435767040. Its totient is φ = 225951040.

The previous prime is 321780079. The next prime is 321780089. The reversal of 321780085 is 580087123.

It is not a de Polignac number, because 321780085 - 2¹³ = 321771893 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 321780085.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (321780089) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99277 + ... + 102466.

It is an arithmetic number, because the mean of its divisors is an integer number (27235440).

Almost surely, 2^321780085 is an apocalyptic number.

It is an amenable number.

321780085 is a deficient number, since it is larger than the sum of its proper divisors (113986955).

321780085 is a wasteful number, since it uses less digits than its factorization.

321780085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 201788.

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 321780085 is about 17938.2297064119. The cubic root of 321780085 is about 685.2563268954.

The spelling of 321780085 in words is "three hundred twenty-one million, seven hundred eighty thousand, eighty-five".