66805470 has 24 divisors (see below), whose sum is σ = 173694456. Its totient is φ = 17814768.

The previous prime is 66805457. The next prime is 66805477. The reversal of 66805470 is 7450866.

It is a happy number.

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66805477) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 371052 + ... + 371231.

It is an arithmetic number, because the mean of its divisors is an integer number (7237269).

Almost surely, 2^66805470 is an apocalyptic number.

66805470 is an abundant number, since it is smaller than the sum of its proper divisors (106888986).

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

66805470 is a wasteful number, since it uses less digits than its factorization.

66805470 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 742296 (or 742293 counting only the distinct ones).

The product of its (nonzero) digits is 40320, while the sum is 36.

The square root of 66805470 is about 8173.4613230871. The cubic root of 66805470 is about 405.7613479309.

The spelling of 66805470 in words is "sixty-six million, eight hundred five thousand, four hundred seventy".