320187715487 has 4 divisors (see below), whose sum is σ = 320228064576. Its totient is φ = 320147366400.

The previous prime is 320187715481. The next prime is 320187715489. The reversal of 320187715487 is 784517781023.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 784517781023 = 4421 ⋅177452563.

It is a cyclic number.

It is not a de Polignac number, because 320187715487 - 2⁸ = 320187715231 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320187715481) 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, 20162639 + ... + 20178512.

It is an arithmetic number, because the mean of its divisors is an integer number (80057016144).

Almost surely, 2^320187715487 is an apocalyptic number.

320187715487 is a deficient number, since it is larger than the sum of its proper divisors (40349089).

320187715487 is an equidigital number, since it uses as much as digits as its factorization.

320187715487 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40349088.

The product of its (nonzero) digits is 2634240, while the sum is 53.

The spelling of 320187715487 in words is "three hundred twenty billion, one hundred eighty-seven million, seven hundred fifteen thousand, four hundred eighty-seven".