66993288 has 16 divisors (see below), whose sum is σ = 167483280. Its totient is φ = 22331088.

The previous prime is 66993287. The next prime is 66993299. The reversal of 66993288 is 88239966.

It is a self number, because there is not a number n which added to its sum of digits gives 66993288.

It is not an unprimeable number, because it can be changed into a prime (66993287) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1395670 + ... + 1395717.

It is an arithmetic number, because the mean of its divisors is an integer number (10467705).

Almost surely, 2^66993288 is an apocalyptic number.

It is an amenable number.

66993288 is an abundant number, since it is smaller than the sum of its proper divisors (100489992).

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

66993288 is a wasteful number, since it uses less digits than its factorization.

66993288 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2791396 (or 2791392 counting only the distinct ones).

The product of its digits is 1119744, while the sum is 51.

The square root of 66993288 is about 8184.9427609483. The cubic root of 66993288 is about 406.1412468499.

The spelling of 66993288 in words is "sixty-six million, nine hundred ninety-three thousand, two hundred eighty-eight".