66647372 has 12 divisors (see below), whose sum is σ = 127235976. Its totient is φ = 30294240.

The previous prime is 66647369. The next prime is 66647387. The reversal of 66647372 is 27374666.

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, 757313 + ... + 757400.

It is an arithmetic number, because the mean of its divisors is an integer number (10602998).

Almost surely, 2^66647372 is an apocalyptic number.

It is an amenable number.

66647372 is a deficient number, since it is larger than the sum of its proper divisors (60588604).

66647372 is a wasteful number, since it uses less digits than its factorization.

66647372 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1514728 (or 1514726 counting only the distinct ones).

The product of its digits is 254016, while the sum is 41.

The square root of 66647372 is about 8163.7841715714. The cubic root of 66647372 is about 405.4410112437.

The spelling of 66647372 in words is "sixty-six million, six hundred forty-seven thousand, three hundred seventy-two".