6520388387 has 4 divisors (see below), whose sum is σ = 6524952720. Its totient is φ = 6515824056.

The previous prime is 6520388359. The next prime is 6520388411. The reversal of 6520388387 is 7838830256.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6520388387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6520388687) 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, 2280023 + ... + 2282880.

It is an arithmetic number, because the mean of its divisors is an integer number (1631238180).

Almost surely, 2^6520388387 is an apocalyptic number.

6520388387 is a deficient number, since it is larger than the sum of its proper divisors (4564333).

6520388387 is a wasteful number, since it uses less digits than its factorization.

6520388387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4564332.

The product of its (nonzero) digits is 1935360, while the sum is 50.

The square root of 6520388387 is about 80748.9218937318. The cubic root of 6520388387 is about 1868.2048208047.

The spelling of 6520388387 in words is "six billion, five hundred twenty million, three hundred eighty-eight thousand, three hundred eighty-seven".