66807090 has 72 divisors (see below), whose sum is σ = 202070700. Its totient is φ = 15269184.

The previous prime is 66807071. The next prime is 66807119. The reversal of 66807090 is 9070866.

It can be written as a sum of positive squares in 2 ways, for example, as 66732561 + 74529 = 8169^2 + 273^2 .

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 3165 + ... + 11984.

Almost surely, 2^66807090 is an apocalyptic number.

66807090 is an abundant number, since it is smaller than the sum of its proper divisors (135263610).

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

66807090 is a wasteful number, since it uses less digits than its factorization.

66807090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 15176 (or 15166 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 36.

The square root of 66807090 is about 8173.5604237077. The cubic root of 66807090 is about 405.7646277426.

The spelling of 66807090 in words is "sixty-six million, eight hundred seven thousand, ninety".