65989998 has 16 divisors (see below), whose sum is σ = 146644560. Its totient is φ = 21996648.

The previous prime is 65989997. The next prime is 65989999. The reversal of 65989998 is 89998956.

It is an interprime number because it is at equal distance from previous prime (65989997) and next prime (65989999).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65989991) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 610965 + ... + 611072.

It is an arithmetic number, because the mean of its divisors is an integer number (9165285).

Almost surely, 2^65989998 is an apocalyptic number.

65989998 is an abundant number, since it is smaller than the sum of its proper divisors (80654562).

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

65989998 is a wasteful number, since it uses less digits than its factorization.

65989998 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1222048 (or 1222042 counting only the distinct ones).

The product of its digits is 12597120, while the sum is 63.

The square root of 65989998 is about 8123.4228007657. The cubic root of 65989998 is about 404.1035866457.

The spelling of 65989998 in words is "sixty-five million, nine hundred eighty-nine thousand, nine hundred ninety-eight".