66028698 has 48 divisors (see below), whose sum is σ = 148591872. Its totient is φ = 21168000.

The previous prime is 66028691. The next prime is 66028723. The reversal of 66028698 is 89682066.

It is not an unprimeable number, because it can be changed into a prime (66028691) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 134233 + ... + 134723.

It is an arithmetic number, because the mean of its divisors is an integer number (3095664).

Almost surely, 2^66028698 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66028698, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (74295936).

66028698 is an abundant number, since it is smaller than the sum of its proper divisors (82563174).

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

66028698 is a wasteful number, since it uses less digits than its factorization.

66028698 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 771 (or 768 counting only the distinct ones).

The product of its (nonzero) digits is 248832, while the sum is 45.

The square root of 66028698 is about 8125.8044524835. The cubic root of 66028698 is about 404.1825670626.

The spelling of 66028698 in words is "sixty-six million, twenty-eight thousand, six hundred ninety-eight".