6420587999 has 16 divisors (see below), whose sum is σ = 7772018688. Its totient is φ = 5177922432.

The previous prime is 6420587983. The next prime is 6420588047. The reversal of 6420587999 is 9997850246.

It is a cyclic number.

It is not a de Polignac number, because 6420587999 - 2⁴ = 6420587983 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6420587099) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 452714 + ... + 466680.

It is an arithmetic number, because the mean of its divisors is an integer number (485751168).

Almost surely, 2^6420587999 is an apocalyptic number.

6420587999 is a deficient number, since it is larger than the sum of its proper divisors (1351430689).

6420587999 is a wasteful number, since it uses less digits than its factorization.

6420587999 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17854.

The product of its (nonzero) digits is 9797760, while the sum is 59.

The square root of 6420587999 is about 80128.5716770242. The cubic root of 6420587999 is about 1858.6242571892.

The spelling of 6420587999 in words is "six billion, four hundred twenty million, five hundred eighty-seven thousand, nine hundred ninety-nine".