66288716 has 24 divisors (see below), whose sum is σ = 125636784. Its totient is φ = 30421440.

The previous prime is 66288689. The next prime is 66288721. The reversal of 66288716 is 61788266.

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, 5891 + ... + 12933.

It is an arithmetic number, because the mean of its divisors is an integer number (5234866).

Almost surely, 2^66288716 is an apocalyptic number.

It is an amenable number.

66288716 is a deficient number, since it is larger than the sum of its proper divisors (59348068).

66288716 is a wasteful number, since it uses less digits than its factorization.

66288716 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7241 (or 7239 counting only the distinct ones).

The product of its digits is 193536, while the sum is 44.

The square root of 66288716 is about 8141.7882556598. The cubic root of 66288716 is about 404.7124229896.

The spelling of 66288716 in words is "sixty-six million, two hundred eighty-eight thousand, seven hundred sixteen".