66331672 has 32 divisors (see below), whose sum is σ = 136468800. Its totient is φ = 29975200.

The previous prime is 66331667. The next prime is 66331687. The reversal of 66331672 is 27613366.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 13647 + ... + 17857.

It is an arithmetic number, because the mean of its divisors is an integer number (4264650).

Almost surely, 2^66331672 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 66331672, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (68234400).

66331672 is an abundant number, since it is smaller than the sum of its proper divisors (70137128).

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

66331672 is a wasteful number, since it uses less digits than its factorization.

66331672 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4407 (or 4403 counting only the distinct ones).

The product of its digits is 27216, while the sum is 34.

The square root of 66331672 is about 8144.4258238380. The cubic root of 66331672 is about 404.7998238528.

The spelling of 66331672 in words is "sixty-six million, three hundred thirty-one thousand, six hundred seventy-two".