320078137 has 4 divisors (see below), whose sum is σ = 320357376. Its totient is φ = 319798900.

The previous prime is 320078119. The next prime is 320078141. The reversal of 320078137 is 731870023.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 731870023 = 433 ⋅1690231.

It is a cyclic number.

It is not a de Polignac number, because 320078137 - 2¹⁹ = 319553849 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 320078099 and 320078108.

It is not an unprimeable number, because it can be changed into a prime (320078107) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 137893 + ... + 140194.

It is an arithmetic number, because the mean of its divisors is an integer number (80089344).

Almost surely, 2^320078137 is an apocalyptic number.

It is an amenable number.

320078137 is a deficient number, since it is larger than the sum of its proper divisors (279239).

320078137 is a wasteful number, since it uses less digits than its factorization.

320078137 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 279238.

The product of its (nonzero) digits is 7056, while the sum is 31.

The square root of 320078137 is about 17890.7276822381. The cubic root of 320078137 is about 684.0460459694.

The spelling of 320078137 in words is "three hundred twenty million, seventy-eight thousand, one hundred thirty-seven".