660006864 has 120 divisors (see below), whose sum is σ = 2080176384. Its totient is φ = 193536000.

The previous prime is 660006859. The next prime is 660006877. The reversal of 660006864 is 468600066.

It is a super-2 number, since 2×660006864² = 871218121054228992, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 42384 + ... + 55824.

Almost surely, 2^660006864 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 660006864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1040088192).

660006864 is an abundant number, since it is smaller than the sum of its proper divisors (1420169520).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

660006864 is a wasteful number, since it uses less digits than its factorization.

660006864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13497 (or 13488 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 36.

The square root of 660006864 is about 25690.5987474017. The cubic root of 660006864 is about 870.6617873906.

The spelling of 660006864 in words is "six hundred sixty million, six thousand, eight hundred sixty-four".