660416 has 28 divisors (see below), whose sum is σ = 1389888. Its totient is φ = 310272.

The previous prime is 660409. The next prime is 660449. The reversal of 660416 is 614066.

It is a super-2 number, since 2×660416² = 872298586112, which contains 22 as substring.

It is a hoax number, since the sum of its digits (23) coincides with the sum of the digits of its distinct prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 660391 and 660400.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 785 + ... + 1391.

2⁶⁶⁰⁴¹⁶ 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 660416, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (694944).

660416 is an abundant number, since it is smaller than the sum of its proper divisors (729472).

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

660416 is a wasteful number, since it uses less digits than its factorization.

660416 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 636 (or 626 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 660416 is about 812.6598304334. The cubic root of 660416 is about 87.0841656985.

The spelling of 660416 in words is "six hundred sixty thousand, four hundred sixteen".