66770020 has 12 divisors (see below), whose sum is σ = 140217084. Its totient is φ = 26708000.

The previous prime is 66770003. The next prime is 66770023. The reversal of 66770020 is 2007766.

It can be written as a sum of positive squares in 2 ways, for example, as 51466276 + 15303744 = 7174^2 + 3912^2 .

It is not an unprimeable number, because it can be changed into a prime (66770023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1669231 + ... + 1669270.

It is an arithmetic number, because the mean of its divisors is an integer number (11684757).

Almost surely, 2^66770020 is an apocalyptic number.

It is an amenable number.

66770020 is an abundant number, since it is smaller than the sum of its proper divisors (73447064).

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

66770020 is a wasteful number, since it uses less digits than its factorization.

66770020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3338510 (or 3338508 counting only the distinct ones).

The product of its (nonzero) digits is 3528, while the sum is 28.

The square root of 66770020 is about 8171.2924314334. The cubic root of 66770020 is about 405.6895634656.

Adding to 66770020 its reverse (2007766), we get a palindrome (68777786).

The spelling of 66770020 in words is "sixty-six million, seven hundred seventy thousand, twenty".