66490288 has 20 divisors (see below), whose sum is σ = 132981568. Its totient is φ = 32172480.

The previous prime is 66490261. The next prime is 66490321. The reversal of 66490288 is 88209466.

It is a happy number.

66490288 is an admirable number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66531 + ... + 67522.

Almost surely, 2^66490288 is an apocalyptic number.

It is an amenable number.

66490288 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

66490288 is a wasteful number, since it uses less digits than its factorization.

66490288 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 134092 (or 134086 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 43.

The square root of 66490288 is about 8154.1577124802. The cubic root of 66490288 is about 405.1222269913.

The spelling of 66490288 in words is "sixty-six million, four hundred ninety thousand, two hundred eighty-eight".