66329680 has 20 divisors (see below), whose sum is σ = 154216692. Its totient is φ = 26531840.

The previous prime is 66329657. The next prime is 66329701. The reversal of 66329680 is 8692366.

It can be written as a sum of positive squares in 2 ways, for example, as 16711744 + 49617936 = 4088^2 + 7044^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 414481 + ... + 414640.

Almost surely, 2^66329680 is an apocalyptic number.

It is an amenable number.

66329680 is an abundant number, since it is smaller than the sum of its proper divisors (87887012).

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

66329680 is a wasteful number, since it uses less digits than its factorization.

66329680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 829134 (or 829128 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 40.

The square root of 66329680 is about 8144.3035306894. The cubic root of 66329680 is about 404.7957716442.

The spelling of 66329680 in words is "sixty-six million, three hundred twenty-nine thousand, six hundred eighty".