66804090 has 32 divisors (see below), whose sum is σ = 160928640. Its totient is φ = 17747904.

The previous prime is 66804043. The next prime is 66804091. The reversal of 66804090 is 9040866.

It is not an unprimeable number, because it can be changed into a prime (66804091) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4291 + ... + 12329.

It is an arithmetic number, because the mean of its divisors is an integer number (5029020).

Almost surely, 2^66804090 is an apocalyptic number.

66804090 is an abundant number, since it is smaller than the sum of its proper divisors (94124550).

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

66804090 is a wasteful number, since it uses less digits than its factorization.

66804090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8326.

The product of its (nonzero) digits is 10368, while the sum is 33.

The square root of 66804090 is about 8173.3769030921. The cubic root of 66804090 is about 405.7585539755.

The spelling of 66804090 in words is "sixty-six million, eight hundred four thousand, ninety".