66628698 has 16 divisors (see below), whose sum is σ = 133604640. Its totient is φ = 22151696.

The previous prime is 66628691. The next prime is 66628733. The reversal of 66628698 is 89682666.

It is a Smith number, since the sum of its digits (51) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 66628698.

It is not an unprimeable number, because it can be changed into a prime (66628691) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 11940 + ... + 16607.

It is an arithmetic number, because the mean of its divisors is an integer number (8350290).

Almost surely, 2^66628698 is an apocalyptic number.

66628698 is an abundant number, since it is smaller than the sum of its proper divisors (66975942).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66628698 is a wasteful number, since it uses less digits than its factorization.

66628698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28941.

The product of its digits is 1492992, while the sum is 51.

The square root of 66628698 is about 8162.6403816412. The cubic root of 66628698 is about 405.4031407198.

The spelling of 66628698 in words is "sixty-six million, six hundred twenty-eight thousand, six hundred ninety-eight".