66398598 has 48 divisors (see below), whose sum is σ = 168438816. Its totient is φ = 18506880.

The previous prime is 66398593. The next prime is 66398623. The reversal of 66398598 is 89589366.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66398593) 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, 1261 + ... + 11592.

It is an arithmetic number, because the mean of its divisors is an integer number (3509142).

Almost surely, 2^66398598 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66398598, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84219408).

66398598 is an abundant number, since it is smaller than the sum of its proper divisors (102040218).

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

66398598 is a wasteful number, since it uses less digits than its factorization.

66398598 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12909 (or 12906 counting only the distinct ones).

The product of its digits is 2799360, while the sum is 54.

The square root of 66398598 is about 8148.5334876897. The cubic root of 66398598 is about 404.9359203602.

The spelling of 66398598 in words is "sixty-six million, three hundred ninety-eight thousand, five hundred ninety-eight".