667720207 has 24 divisors (see below), whose sum is σ = 849601872. Its totient is φ = 518918400.

The previous prime is 667720187. The next prime is 667720217. The reversal of 667720207 is 702027766.

It is not a de Polignac number, because 667720207 - 2¹⁵ = 667687439 is a prime.

It is a super-2 number, since 2×667720207² = 891700549672245698, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667720217) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 231957 + ... + 234817.

It is an arithmetic number, because the mean of its divisors is an integer number (35400078).

Almost surely, 2^667720207 is an apocalyptic number.

667720207 is a deficient number, since it is larger than the sum of its proper divisors (181881665).

667720207 is a wasteful number, since it uses less digits than its factorization.

667720207 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3319 (or 3312 counting only the distinct ones).

The product of its (nonzero) digits is 49392, while the sum is 37.

The square root of 667720207 is about 25840.2826416431. The cubic root of 667720207 is about 874.0403986688.

The spelling of 667720207 in words is "six hundred sixty-seven million, seven hundred twenty thousand, two hundred seven".