660408084 has 144 divisors (see below), whose sum is σ = 1974336000. Its totient is φ = 186024384.

The previous prime is 660408041. The next prime is 660408101. The reversal of 660408084 is 480804066.

It is a super-2 number, since 2×660408084² = 872277674825102112, 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 polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 975154 + ... + 975830.

Almost surely, 2^660408084 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 660408084, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (987168000).

660408084 is an abundant number, since it is smaller than the sum of its proper divisors (1313927916).

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

660408084 is a wasteful number, since it uses less digits than its factorization.

660408084 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787 (or 768 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 36.

The square root of 660408084 is about 25698.4062540851. The cubic root of 660408084 is about 870.8381775565.

The spelling of 660408084 in words is "six hundred sixty million, four hundred eight thousand, eighty-four".