6420758409 has 64 divisors (see below), whose sum is σ = 10821099520. Its totient is φ = 3734579520.

The previous prime is 6420758387. The next prime is 6420758411. The reversal of 6420758409 is 9048570246.

It is a happy number.

6420758409 is a `hidden beast` number, since 64 + 2 + 0 + 7 + 584 + 0 + 9 = 666.

It is not a de Polignac number, because 6420758409 - 2⁸ = 6420758153 is a prime.

It is a super-2 number, since 2×6420758409² = 82452277093488422562, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6420758459) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 461022 + ... + 474744.

It is an arithmetic number, because the mean of its divisors is an integer number (169079680).

Almost surely, 2^6420758409 is an apocalyptic number.

It is an amenable number.

6420758409 is a deficient number, since it is larger than the sum of its proper divisors (4400341111).

6420758409 is a wasteful number, since it uses less digits than its factorization.

6420758409 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13819 (or 13813 counting only the distinct ones).

The product of its (nonzero) digits is 483840, while the sum is 45.

The square root of 6420758409 is about 80129.6350235043. The cubic root of 6420758409 is about 1858.6407004058.

The spelling of 6420758409 in words is "six billion, four hundred twenty million, seven hundred fifty-eight thousand, four hundred nine".