66729898 has 8 divisors (see below), whose sum is σ = 100129860. Its totient is φ = 33353280.

The previous prime is 66729893. The next prime is 66729911. The reversal of 66729898 is 89892766.

It can be written as a sum of positive squares in 2 ways, for example, as 62457409 + 4272489 = 7903^2 + 2067^2 .

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

It is not an unprimeable number, because it can be changed into a prime (66729893) 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, 6688 + ... + 13348.

Almost surely, 2^66729898 is an apocalyptic number.

66729898 is a deficient number, since it is larger than the sum of its proper divisors (33399962).

66729898 is a wasteful number, since it uses less digits than its factorization.

66729898 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11672.

The product of its digits is 2612736, while the sum is 55.

The square root of 66729898 is about 8168.8370041273. The cubic root of 66729898 is about 405.6082877770.

The spelling of 66729898 in words is "sixty-six million, seven hundred twenty-nine thousand, eight hundred ninety-eight".