660415 has 8 divisors (see below), whose sum is σ = 905760. Its totient is φ = 452832.

The previous prime is 660409. The next prime is 660449. The reversal of 660415 is 514066.

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

It is a cyclic number.

It is not a de Polignac number, because 660415 - 2¹¹ = 658367 is a prime.

It is a super-2 number, since 2×660415² = 872295944450, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9400 + ... + 9469.

It is an arithmetic number, because the mean of its divisors is an integer number (113220).

2⁶⁶⁰⁴¹⁵ is an apocalyptic number.

660415 is a deficient number, since it is larger than the sum of its proper divisors (245345).

660415 is a wasteful number, since it uses less digits than its factorization.

660415 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18881.

The product of its (nonzero) digits is 720, while the sum is 22.

The square root of 660415 is about 812.6592151696. The cubic root of 660415 is about 87.0841217442.

The spelling of 660415 in words is "six hundred sixty thousand, four hundred fifteen".