664579870 has 8 divisors (see below), whose sum is σ = 1196243784. Its totient is φ = 265831944.

The previous prime is 664579831. The next prime is 664579873. The reversal of 664579870 is 78975466.

It is a happy number.

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 (664579873) 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, 33228984 + ... + 33229003.

It is an arithmetic number, because the mean of its divisors is an integer number (149530473).

Almost surely, 2^664579870 is an apocalyptic number.

664579870 is a deficient number, since it is larger than the sum of its proper divisors (531663914).

664579870 is a wasteful number, since it uses less digits than its factorization.

664579870 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66457994.

The product of its (nonzero) digits is 2540160, while the sum is 52.

The square root of 664579870 is about 25779.4466581422. The cubic root of 664579870 is about 872.6680196284.

The spelling of 664579870 in words is "six hundred sixty-four million, five hundred seventy-nine thousand, eight hundred seventy".