664501798 has 8 divisors (see below), whose sum is σ = 1007028792. Its totient is φ = 328825536.

The previous prime is 664501793. The next prime is 664501813. The reversal of 664501798 is 897105466.

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 (664501793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1712440 + ... + 1712827.

It is an arithmetic number, because the mean of its divisors is an integer number (125878599).

Almost surely, 2^664501798 is an apocalyptic number.

664501798 is a deficient number, since it is larger than the sum of its proper divisors (342526994).

664501798 is a wasteful number, since it uses less digits than its factorization.

664501798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3425366.

The product of its (nonzero) digits is 362880, while the sum is 46.

The square root of 664501798 is about 25777.9323841149. The cubic root of 664501798 is about 872.6338458549.

The spelling of 664501798 in words is "six hundred sixty-four million, five hundred one thousand, seven hundred ninety-eight".