66827798 has 4 divisors (see below), whose sum is σ = 100241700. Its totient is φ = 33413898.

The previous prime is 66827797. The next prime is 66827801. The reversal of 66827798 is 89772866.

It is a happy number.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66827797) 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 as a sum of consecutive naturals, namely, 16706948 + ... + 16706951.

It is an arithmetic number, because the mean of its divisors is an integer number (25060425).

Almost surely, 2^66827798 is an apocalyptic number.

66827798 is a deficient number, since it is larger than the sum of its proper divisors (33413902).

66827798 is a wasteful number, since it uses less digits than its factorization.

66827798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33413901.

The product of its digits is 2032128, while the sum is 53.

The square root of 66827798 is about 8174.8270929727. The cubic root of 66827798 is about 405.8065479733.

The spelling of 66827798 in words is "sixty-six million, eight hundred twenty-seven thousand, seven hundred ninety-eight".