6427640464 has 30 divisors (see below), whose sum is σ = 14486788374. Its totient is φ = 2754702720.

The previous prime is 6427640447. The next prime is 6427640491. The reversal of 6427640464 is 4640467246.

It can be written as a sum of positive squares in only one way, i.e., 3671390464 + 2756250000 = 60592^2 + 52500^2 .

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 6427640464.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4098477 + ... + 4100044.

Almost surely, 2^6427640464 is an apocalyptic number.

It is an amenable number.

6427640464 is an abundant number, since it is smaller than the sum of its proper divisors (8059147910).

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

6427640464 is a wasteful number, since it uses less digits than its factorization.

6427640464 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8198543 (or 8198530 counting only the distinct ones).

The product of its (nonzero) digits is 774144, while the sum is 43.

The square root of 6427640464 is about 80172.5667794165. The cubic root of 6427640464 is about 1859.3045212686.

The spelling of 6427640464 in words is "six billion, four hundred twenty-seven million, six hundred forty thousand, four hundred sixty-four".