320678865 has 128 divisors (see below), whose sum is σ = 661248000. Its totient is φ = 146126592.

The previous prime is 320678863. The next prime is 320678867. The reversal of 320678865 is 568876023.

It is an interprime number because it is at equal distance from previous prime (320678863) and next prime (320678867).

It is not a de Polignac number, because 320678865 - 2¹ = 320678863 is a prime.

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

It is a self number, because there is not a number n which added to its sum of digits gives 320678865.

It is not an unprimeable number, because it can be changed into a prime (320678863) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 1967274 + ... + 1967436.

It is an arithmetic number, because the mean of its divisors is an integer number (5166000).

Almost surely, 2^320678865 is an apocalyptic number.

It is an amenable number.

320678865 is an abundant number, since it is smaller than the sum of its proper divisors (340569135).

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

320678865 is a wasteful number, since it uses less digits than its factorization.

320678865 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 268 (or 262 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 320678865 is about 17907.5086206876. The cubic root of 320678865 is about 684.4737215440.

The spelling of 320678865 in words is "three hundred twenty million, six hundred seventy-eight thousand, eight hundred sixty-five".