66431090 has 16 divisors (see below), whose sum is σ = 130446720. Its totient is φ = 24156720.

The previous prime is 66431063. The next prime is 66431093. The reversal of 66431090 is 9013466.

It is not an unprimeable number, because it can be changed into a prime (66431093) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301850 + ... + 302069.

It is an arithmetic number, because the mean of its divisors is an integer number (8152920).

Almost surely, 2^66431090 is an apocalyptic number.

66431090 is a deficient number, since it is larger than the sum of its proper divisors (64015630).

66431090 is a wasteful number, since it uses less digits than its factorization.

66431090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 603937.

The product of its (nonzero) digits is 3888, while the sum is 29.

The square root of 66431090 is about 8150.5269768279. The cubic root of 66431090 is about 405.0019610737.

The spelling of 66431090 in words is "sixty-six million, four hundred thirty-one thousand, ninety".