6390364840 has 16 divisors (see below), whose sum is σ = 14378320980. Its totient is φ = 2556145920.

The previous prime is 6390364817. The next prime is 6390364843. The reversal of 6390364840 is 484630936.

It can be written as a sum of positive squares in 2 ways, for example, as 6309760356 + 80604484 = 79434^2 + 8978^2 .

It is not an unprimeable number, because it can be changed into a prime (6390364843) 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, 79879521 + ... + 79879600.

Almost surely, 2^6390364840 is an apocalyptic number.

It is an amenable number.

6390364840 is an abundant number, since it is smaller than the sum of its proper divisors (7987956140).

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

6390364840 is a wasteful number, since it uses less digits than its factorization.

6390364840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159759132 (or 159759128 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 43.

The square root of 6390364840 is about 79939.7575678085. The cubic root of 6390364840 is about 1855.7033477580.

The spelling of 6390364840 in words is "six billion, three hundred ninety million, three hundred sixty-four thousand, eight hundred forty".