407878666 has 16 divisors (see below), whose sum is σ = 659602944. Its totient is φ = 188045424.

The previous prime is 407878657. The next prime is 407878697. The reversal of 407878666 is 666878704.

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, 17031 + ... + 33253.

It is an arithmetic number, because the mean of its divisors is an integer number (41225184).

Almost surely, 2^407878666 is an apocalyptic number.

407878666 is a deficient number, since it is larger than the sum of its proper divisors (251724278).

407878666 is a wasteful number, since it uses less digits than its factorization.

407878666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17205.

The product of its (nonzero) digits is 2709504, while the sum is 52.

The square root of 407878666 is about 20196.0061893435. The cubic root of 407878666 is about 741.6124239139.

The spelling of 407878666 in words is "four hundred seven million, eight hundred seventy-eight thousand, six hundred sixty-six".