66623312 has 40 divisors (see below), whose sum is σ = 147907200. Its totient is φ = 28478592.

The previous prime is 66623303. The next prime is 66623351. The reversal of 66623312 is 21332666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 78989 + ... + 79827.

It is an arithmetic number, because the mean of its divisors is an integer number (3697680).

Almost surely, 2^66623312 is an apocalyptic number.

It is an amenable number.

66623312 is an abundant number, since it is smaller than the sum of its proper divisors (81283888).

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

66623312 is a wasteful number, since it uses less digits than its factorization.

66623312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1563 (or 1557 counting only the distinct ones).

The product of its digits is 7776, while the sum is 29.

The square root of 66623312 is about 8162.3104572174. The cubic root of 66623312 is about 405.3922166975.

Adding to 66623312 its reverse (21332666), we get a palindrome (87955978).

The spelling of 66623312 in words is "sixty-six million, six hundred twenty-three thousand, three hundred twelve".