66688098 has 32 divisors (see below), whose sum is σ = 139081536. Its totient is φ = 21298368.

The previous prime is 66688073. The next prime is 66688103. The reversal of 66688098 is 89088666.

It is a self number, because there is not a number n which added to its sum of digits gives 66688098.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 11236 + ... + 16112.

It is an arithmetic number, because the mean of its divisors is an integer number (4346298).

Almost surely, 2^66688098 is an apocalyptic number.

66688098 is an abundant number, since it is smaller than the sum of its proper divisors (72393438).

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

66688098 is a wasteful number, since it uses less digits than its factorization.

66688098 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4978.

The product of its (nonzero) digits is 995328, while the sum is 51.

The square root of 66688098 is about 8166.2780995996. The cubic root of 66688098 is about 405.5235782826.

The spelling of 66688098 in words is "sixty-six million, six hundred eighty-eight thousand, ninety-eight".