6390744280 has 64 divisors (see below), whose sum is σ = 14729299200. Its totient is φ = 2494181760.

The previous prime is 6390744247. The next prime is 6390744289. The reversal of 6390744280 is 824470936.

It is a super-2 number, since 2×6390744280² = 81683224904705436800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (43).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6390744289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2597691 + ... + 2600149.

It is an arithmetic number, because the mean of its divisors is an integer number (230145300).

Almost surely, 2^6390744280 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 6390744280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (7364649600).

6390744280 is an abundant number, since it is smaller than the sum of its proper divisors (8338554920).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6390744280 is a wasteful number, since it uses less digits than its factorization.

6390744280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4024 (or 4020 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 43.

The square root of 6390744280 is about 79942.1308197373. The cubic root of 6390744280 is about 1855.7400756633.

The spelling of 6390744280 in words is "six billion, three hundred ninety million, seven hundred forty-four thousand, two hundred eighty".