664087407 has 4 divisors (see below), whose sum is σ = 885449880. Its totient is φ = 442724936.

The previous prime is 664087381. The next prime is 664087427. The reversal of 664087407 is 704780466.

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 664087407 - 2⁶ = 664087343 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664087427) 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, 110681232 + ... + 110681237.

It is an arithmetic number, because the mean of its divisors is an integer number (221362470).

Almost surely, 2^664087407 is an apocalyptic number.

664087407 is a deficient number, since it is larger than the sum of its proper divisors (221362473).

664087407 is a wasteful number, since it uses less digits than its factorization.

664087407 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 221362472.

The product of its (nonzero) digits is 225792, while the sum is 42.

The square root of 664087407 is about 25769.8934223640. The cubic root of 664087407 is about 872.4524132852.

The spelling of 664087407 in words is "six hundred sixty-four million, eighty-seven thousand, four hundred seven".