646089790 has 8 divisors (see below), whose sum is σ = 1162961640. Its totient is φ = 258435912.

The previous prime is 646089781. The next prime is 646089793. The reversal of 646089790 is 97980646.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (646089793) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32304480 + ... + 32304499.

It is an arithmetic number, because the mean of its divisors is an integer number (145370205).

Almost surely, 2^646089790 is an apocalyptic number.

646089790 is a deficient number, since it is larger than the sum of its proper divisors (516871850).

646089790 is a wasteful number, since it uses less digits than its factorization.

646089790 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64608986.

The product of its (nonzero) digits is 653184, while the sum is 49.

The square root of 646089790 is about 25418.2963630531. The cubic root of 646089790 is about 864.4985967811.

The spelling of 646089790 in words is "six hundred forty-six million, eighty-nine thousand, seven hundred ninety".