66440770 has 16 divisors (see below), whose sum is σ = 130465728. Its totient is φ = 24160240.

The previous prime is 66440761. The next prime is 66440771. The reversal of 66440770 is 7704466.

It is not an unprimeable number, because it can be changed into a prime (66440771) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 301894 + ... + 302113.

It is an arithmetic number, because the mean of its divisors is an integer number (8154108).

Almost surely, 2^66440770 is an apocalyptic number.

66440770 is a deficient number, since it is larger than the sum of its proper divisors (64024958).

66440770 is a wasteful number, since it uses less digits than its factorization.

66440770 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 604025.

The product of its (nonzero) digits is 28224, while the sum is 34.

The square root of 66440770 is about 8151.1207818312. The cubic root of 66440770 is about 405.0216317258.

The spelling of 66440770 in words is "sixty-six million, four hundred forty thousand, seven hundred seventy".