65197998 has 12 divisors (see below), whose sum is σ = 141262368. Its totient is φ = 21732660.

The previous prime is 65197981. The next prime is 65197999. The reversal of 65197998 is 89979156.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65197999) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1811038 + ... + 1811073.

It is an arithmetic number, because the mean of its divisors is an integer number (11771864).

Almost surely, 2^65197998 is an apocalyptic number.

65197998 is an abundant number, since it is smaller than the sum of its proper divisors (76064370).

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

65197998 is a wasteful number, since it uses less digits than its factorization.

65197998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3622119 (or 3622116 counting only the distinct ones).

The product of its digits is 1224720, while the sum is 54.

The square root of 65197998 is about 8074.5277261274. The cubic root of 65197998 is about 402.4804162121.

The spelling of 65197998 in words is "sixty-five million, one hundred ninety-seven thousand, nine hundred ninety-eight".