66770090 has 16 divisors (see below), whose sum is σ = 121377960. Its totient is φ = 26443200.

The previous prime is 66770083. The next prime is 66770117. The reversal of 66770090 is 9007766.

It can be written as a sum of positive squares in 4 ways, for example, as 66275881 + 494209 = 8141^2 + 703^2 .

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66770090.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 32045 + ... + 34064.

Almost surely, 2^66770090 is an apocalyptic number.

66770090 is a deficient number, since it is larger than the sum of its proper divisors (54607870).

66770090 is a wasteful number, since it uses less digits than its factorization.

66770090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 66217.

The product of its (nonzero) digits is 15876, while the sum is 35.

The square root of 66770090 is about 8171.2967147204. The cubic root of 66770090 is about 405.6897052371.

The spelling of 66770090 in words is "sixty-six million, seven hundred seventy thousand, ninety".