66718730 has 32 divisors (see below), whose sum is σ = 130032000. Its totient is φ = 24501312.

The previous prime is 66718721. The next prime is 66718759. The reversal of 66718730 is 3781766.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 24581 + ... + 27159.

It is an arithmetic number, because the mean of its divisors is an integer number (4063500).

Almost surely, 2^66718730 is an apocalyptic number.

66718730 is a deficient number, since it is larger than the sum of its proper divisors (63313270).

66718730 is a wasteful number, since it uses less digits than its factorization.

66718730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2798.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 66718730 is about 8168.1534020854. The cubic root of 66718730 is about 405.5856588095.

The spelling of 66718730 in words is "sixty-six million, seven hundred eighteen thousand, seven hundred thirty".