667229989 has 4 divisors (see below), whose sum is σ = 667326924. Its totient is φ = 667133056.

The previous prime is 667229987. The next prime is 667229993. The reversal of 667229989 is 989922766.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 59213025 + 608016964 = 7695^2 + 24658^2 .

It is a cyclic number.

It is not a de Polignac number, because 667229989 - 2¹ = 667229987 is a prime.

It is a Smith number, since the sum of its digits (58) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (667229987) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 37282 + ... + 52195.

It is an arithmetic number, because the mean of its divisors is an integer number (166831731).

Almost surely, 2^667229989 is an apocalyptic number.

It is an amenable number.

667229989 is a deficient number, since it is larger than the sum of its proper divisors (96935).

667229989 is an equidigital number, since it uses as much as digits as its factorization.

667229989 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 96934.

The product of its digits is 5878656, while the sum is 58.

The square root of 667229989 is about 25830.7953613511. The cubic root of 667229989 is about 873.8264491579.

The spelling of 667229989 in words is "six hundred sixty-seven million, two hundred twenty-nine thousand, nine hundred eighty-nine".