6640355 has 8 divisors (see below), whose sum is σ = 8225664. Its totient is φ = 5140800.

The previous prime is 6640349. The next prime is 6640369. The reversal of 6640355 is 5530466.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 6640355 - 2⁴ = 6640339 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 21266 + ... + 21575.

It is an arithmetic number, because the mean of its divisors is an integer number (1028208).

Almost surely, 2^6640355 is an apocalyptic number.

6640355 is a deficient number, since it is larger than the sum of its proper divisors (1585309).

6640355 is a wasteful number, since it uses less digits than its factorization.

6640355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42877.

The product of its (nonzero) digits is 10800, while the sum is 29.

The square root of 6640355 is about 2576.8886277835. Note that the first 3 decimals coincide. The cubic root of 6640355 is about 187.9592770555.

The spelling of 6640355 in words is "six million, six hundred forty thousand, three hundred fifty-five".