664306087 has 4 divisors (see below), whose sum is σ = 664449760. Its totient is φ = 664162416.

The previous prime is 664306061. The next prime is 664306091. The reversal of 664306087 is 780603466.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 664306087 - 2⁷ = 664305959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664306387) 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, 64662 + ... + 74227.

It is an arithmetic number, because the mean of its divisors is an integer number (166112440).

Almost surely, 2^664306087 is an apocalyptic number.

664306087 is a deficient number, since it is larger than the sum of its proper divisors (143673).

664306087 is a wasteful number, since it uses less digits than its factorization.

664306087 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143672.

The product of its (nonzero) digits is 145152, while the sum is 40.

The square root of 664306087 is about 25774.1360087977. The cubic root of 664306087 is about 872.5481672245.

The spelling of 664306087 in words is "six hundred sixty-four million, three hundred six thousand, eighty-seven".