66290812 has 24 divisors (see below), whose sum is σ = 133468160. Its totient is φ = 28220400.

The previous prime is 66290801. The next prime is 66290813. The reversal of 66290812 is 21809266.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66290813) 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, 3612 + ... + 12067.

Almost surely, 2^66290812 is an apocalyptic number.

It is an amenable number.

66290812 is an abundant number, since it is smaller than the sum of its proper divisors (67177348).

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

66290812 is a wasteful number, since it uses less digits than its factorization.

66290812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15841 (or 15839 counting only the distinct ones).

The product of its (nonzero) digits is 10368, while the sum is 34.

The square root of 66290812 is about 8141.9169732932. The cubic root of 66290812 is about 404.7166885135.

The spelling of 66290812 in words is "sixty-six million, two hundred ninety thousand, eight hundred twelve".