667244787 has 8 divisors (see below), whose sum is σ = 970537920. Its totient is φ = 404390760.

The previous prime is 667244777. The next prime is 667244827. The reversal of 667244787 is 787442766.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 667244787 - 2⁴ = 667244771 is a prime.

It is not an unprimeable number, because it can be changed into a prime (667244737) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10109737 + ... + 10109802.

It is an arithmetic number, because the mean of its divisors is an integer number (121317240).

Almost surely, 2^667244787 is an apocalyptic number.

667244787 is a deficient number, since it is larger than the sum of its proper divisors (303293133).

667244787 is a wasteful number, since it uses less digits than its factorization.

667244787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20219553.

The product of its digits is 3161088, while the sum is 51.

The square root of 667244787 is about 25831.0818008073. The cubic root of 667244787 is about 873.8329090935.

The spelling of 667244787 in words is "six hundred sixty-seven million, two hundred forty-four thousand, seven hundred eighty-seven".