660438016 has 88 divisors (see below), whose sum is σ = 1519692800. Its totient is φ = 281014272.

The previous prime is 660437993. The next prime is 660438017. The reversal of 660438016 is 610834066.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (660438017) 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, 1426201 + ... + 1426663.

Almost surely, 2^660438016 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 660438016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (759846400).

660438016 is an abundant number, since it is smaller than the sum of its proper divisors (859254784).

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

660438016 is a wasteful number, since it uses less digits than its factorization.

660438016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 689 (or 671 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 34.

The square root of 660438016 is about 25698.9886182317. The cubic root of 660438016 is about 870.8513338332.

The spelling of 660438016 in words is "six hundred sixty million, four hundred thirty-eight thousand, sixteen".