646355 has 8 divisors (see below), whose sum is σ = 780192. Its totient is φ = 514048.

The previous prime is 646339. The next prime is 646379. The reversal of 646355 is 553646.

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

It is a cyclic number.

It is not a de Polignac number, because 646355 - 2⁴ = 646339 is a prime.

It is a Duffinian number.

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, 1034 + ... + 1536.

It is an arithmetic number, because the mean of its divisors is an integer number (97524).

2⁶⁴⁶³⁵⁵ is an apocalyptic number.

646355 is a deficient number, since it is larger than the sum of its proper divisors (133837).

646355 is a wasteful number, since it uses less digits than its factorization.

646355 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 765.

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

The square root of 646355 is about 803.9620637816. The cubic root of 646355 is about 86.4616868427.

It can be divided in two parts, 646 and 355, that added together give a palindrome (1001).

The spelling of 646355 in words is "six hundred forty-six thousand, three hundred fifty-five".