6278660644 has 9 divisors (see below), whose sum is σ = 10987933467. Its totient is φ = 3139251084.

The previous prime is 6278660639. The next prime is 6278660669. The reversal of 6278660644 is 4460668726.

It is a happy number.

The square root of 6278660644 is 79238.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 138667 + ... + 178285.

Almost surely, 2^6278660644 is an apocalyptic number.

6278660644 is the 79238-th square number.

It is an amenable number.

6278660644 is a deficient number, since it is larger than the sum of its proper divisors (4709272823).

6278660644 is an frugal number, since it uses more digits than its factorization.

6278660644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79242 (or 39621 counting only the distinct ones).

The product of its (nonzero) digits is 2322432, while the sum is 49.

The cubic root of 6278660644 is about 1844.8271020869.

Multiplying 6278660644 by its sum of digits (49), we get a square (307654371556 = 554666²).

The spelling of 6278660644 in words is "six billion, two hundred seventy-eight million, six hundred sixty thousand, six hundred forty-four".