97218198 has 128 divisors (see below), whose sum is σ = 273162240. Its totient is φ = 24896160.

The previous prime is 97218197. The next prime is 97218211. The reversal of 97218198 is 89181279.

It is a nialpdrome in base 14.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (97218197) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 428161 + ... + 428387.

It is an arithmetic number, because the mean of its divisors is an integer number (2134080).

Almost surely, 2^97218198 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 97218198, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (136581120).

97218198 is an abundant number, since it is smaller than the sum of its proper divisors (175944042).

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

97218198 is a wasteful number, since it uses less digits than its factorization.

97218198 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 359 (or 353 counting only the distinct ones).

The product of its digits is 72576, while the sum is 45.

The square root of 97218198 is about 9859.9289044090. The cubic root of 97218198 is about 459.8143516766.

It can be divided in two parts, 972181 and 98, that added together give a palindrome (972279).

The spelling of 97218198 in words is "ninety-seven million, two hundred eighteen thousand, one hundred ninety-eight".