667020305 has 32 divisors (see below), whose sum is σ = 930493440. Its totient is φ = 449579520.

The previous prime is 667020301. The next prime is 667020307. The reversal of 667020305 is 503020766.

It is not a de Polignac number, because 667020305 - 2² = 667020301 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (667020301) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 876125 + ... + 876885.

It is an arithmetic number, because the mean of its divisors is an integer number (29077920).

Almost surely, 2^667020305 is an apocalyptic number.

It is an amenable number.

667020305 is a deficient number, since it is larger than the sum of its proper divisors (263473135).

667020305 is a wasteful number, since it uses less digits than its factorization.

667020305 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1169.

The product of its (nonzero) digits is 7560, while the sum is 29.

The square root of 667020305 is about 25826.7362436681. The cubic root of 667020305 is about 873.7349032016.

The spelling of 667020305 in words is "six hundred sixty-seven million, twenty thousand, three hundred five".