66928205 has 8 divisors (see below), whose sum is σ = 81025272. Its totient is φ = 53068288.

The previous prime is 66928193. The next prime is 66928207. The reversal of 66928205 is 50282966.

It can be written as a sum of positive squares in 4 ways, for example, as 8145316 + 58782889 = 2854^2 + 7667^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66928205 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66928207) 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, 58664 + ... + 59793.

It is an arithmetic number, because the mean of its divisors is an integer number (10128159).

Almost surely, 2^66928205 is an apocalyptic number.

It is an amenable number.

66928205 is a deficient number, since it is larger than the sum of its proper divisors (14097067).

66928205 is a wasteful number, since it uses less digits than its factorization.

66928205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 118575.

The product of its (nonzero) digits is 51840, while the sum is 38.

The square root of 66928205 is about 8180.9660187535. The cubic root of 66928205 is about 406.0096841422.

The spelling of 66928205 in words is "sixty-six million, nine hundred twenty-eight thousand, two hundred five".