320768137 has 6 divisors (see below), whose sum is σ = 326937422. Its totient is φ = 314713152.

The previous prime is 320768117. The next prime is 320768171. The reversal of 320768137 is 731867023.

It can be written as a sum of positive squares in 3 ways, for example, as 173606976 + 147161161 = 13176^2 + 12131^2 .

It is not a de Polignac number, because 320768137 - 2⁷ = 320768009 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320768096 and 320768105.

It is not an unprimeable number, because it can be changed into a prime (320768117) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 54288 + ... + 59905.

Almost surely, 2^320768137 is an apocalyptic number.

It is an amenable number.

320768137 is a deficient number, since it is larger than the sum of its proper divisors (6169285).

320768137 is an equidigital number, since it uses as much as digits as its factorization.

320768137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 114299 (or 114246 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 320768137 is about 17910.0010329425. The cubic root of 320768137 is about 684.5372312578.

Subtracting from 320768137 its sum of digits (37), we obtain a square (320768100 = 17910²).

The spelling of 320768137 in words is "three hundred twenty million, seven hundred sixty-eight thousand, one hundred thirty-seven".