662021678 has 8 divisors (see below), whose sum is σ = 1025065920. Its totient is φ = 320333040.

The previous prime is 662021677. The next prime is 662021699. The reversal of 662021678 is 876120266.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (662021671) 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 3 ways as a sum of consecutive naturals, for example, 5338823 + ... + 5338946.

It is an arithmetic number, because the mean of its divisors is an integer number (128133240).

Almost surely, 2^662021678 is an apocalyptic number.

662021678 is a deficient number, since it is larger than the sum of its proper divisors (363044242).

662021678 is a wasteful number, since it uses less digits than its factorization.

662021678 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10677802.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 662021678 is about 25729.7819267867. The cubic root of 662021678 is about 871.5468486570.

The spelling of 662021678 in words is "six hundred sixty-two million, twenty-one thousand, six hundred seventy-eight".