6647394490 has 16 divisors (see below), whose sum is σ = 13053065760. Its totient is φ = 2417234320.

The previous prime is 6647394437. The next prime is 6647394491. The reversal of 6647394490 is 944937466.

It is not an unprimeable number, because it can be changed into a prime (6647394491) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 30215320 + ... + 30215539.

It is an arithmetic number, because the mean of its divisors is an integer number (815816610).

Almost surely, 2^6647394490 is an apocalyptic number.

6647394490 is a deficient number, since it is larger than the sum of its proper divisors (6405671270).

6647394490 is a wasteful number, since it uses less digits than its factorization.

6647394490 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60430877.

The product of its (nonzero) digits is 3919104, while the sum is 52.

The square root of 6647394490 is about 81531.5551795745. Note that the first 3 decimals coincide. The cubic root of 6647394490 is about 1880.2567261072.

The spelling of 6647394490 in words is "six billion, six hundred forty-seven million, three hundred ninety-four thousand, four hundred ninety".