6640628086 has 4 divisors (see below), whose sum is σ = 9960942132. Its totient is φ = 3320314042.

The previous prime is 6640628069. The next prime is 6640628089. The reversal of 6640628086 is 6808260466.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6640628089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1660157020 + ... + 1660157023.

It is an arithmetic number, because the mean of its divisors is an integer number (2490235533).

Almost surely, 2^6640628086 is an apocalyptic number.

6640628086 is a deficient number, since it is larger than the sum of its proper divisors (3320314046).

6640628086 is a wasteful number, since it uses less digits than its factorization.

6640628086 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3320314045.

The product of its (nonzero) digits is 663552, while the sum is 46.

The square root of 6640628086 is about 81490.0489998626. The cubic root of 6640628086 is about 1879.6185364186.

The spelling of 6640628086 in words is "six billion, six hundred forty million, six hundred twenty-eight thousand, eighty-six".