664120587 has 8 divisors (see below), whose sum is σ = 953609104. Its totient is φ = 408689568.

The previous prime is 664120577. The next prime is 664120627. The reversal of 664120587 is 785021466.

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

It is not a de Polignac number, because 664120587 - 2¹² = 664116491 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 17028733 = 664120587 / (6 + 6 + 4 + 1 + 2 + 0 + 5 + 8 + 7).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664120577) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8514328 + ... + 8514405.

It is an arithmetic number, because the mean of its divisors is an integer number (119201138).

Almost surely, 2^664120587 is an apocalyptic number.

664120587 is a deficient number, since it is larger than the sum of its proper divisors (289488517).

664120587 is a wasteful number, since it uses less digits than its factorization.

664120587 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17028749.

The product of its (nonzero) digits is 80640, while the sum is 39.

The square root of 664120587 is about 25770.5371888131. The cubic root of 664120587 is about 872.4669432445.

The spelling of 664120587 in words is "six hundred sixty-four million, one hundred twenty thousand, five hundred eighty-seven".