667777005 has 48 divisors (see below), whose sum is σ = 1324652160. Its totient is φ = 304850304.

The previous prime is 667777001. The next prime is 667777013. The reversal of 667777005 is 500777766.

It is a happy number.

It is not a de Polignac number, because 667777005 - 2² = 667777001 is a prime.

It is a super-3 number, since 3×667777005³ (a number of 27 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667777001) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 456966 + ... + 458424.

It is an arithmetic number, because the mean of its divisors is an integer number (27596920).

Almost surely, 2^667777005 is an apocalyptic number.

It is an amenable number.

667777005 is a deficient number, since it is larger than the sum of its proper divisors (656875155).

667777005 is a wasteful number, since it uses less digits than its factorization.

667777005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2930 (or 2927 counting only the distinct ones).

The product of its (nonzero) digits is 432180, while the sum is 45.

The square root of 667777005 is about 25841.3816387592. The cubic root of 667777005 is about 874.0651806751.

The spelling of 667777005 in words is "six hundred sixty-seven million, seven hundred seventy-seven thousand, five".