65997798 has 16 divisors (see below), whose sum is σ = 132076656. Its totient is φ = 21985760.

The previous prime is 65997793. The next prime is 65997821. The reversal of 65997798 is 89779956.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (65997793) 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 7 ways as a sum of consecutive naturals, for example, 14440 + ... + 18452.

It is an arithmetic number, because the mean of its divisors is an integer number (8254791).

Almost surely, 2^65997798 is an apocalyptic number.

65997798 is an abundant number, since it is smaller than the sum of its proper divisors (66078858).

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

65997798 is a wasteful number, since it uses less digits than its factorization.

65997798 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6759.

The product of its digits is 8573040, while the sum is 60.

The square root of 65997798 is about 8123.9028797740. The cubic root of 65997798 is about 404.1195076635.

It can be divided in two parts, 65997 and 798, that added together give a triangular number (66795 = T₃₆₅).

The spelling of 65997798 in words is "sixty-five million, nine hundred ninety-seven thousand, seven hundred ninety-eight".