66864398 has 16 divisors (see below), whose sum is σ = 103171200. Its totient is φ = 32482296.

The previous prime is 66864397. The next prime is 66864419. The reversal of 66864398 is 89346866.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66864397) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 15161 + ... + 19067.

It is an arithmetic number, because the mean of its divisors is an integer number (6448200).

Almost surely, 2^66864398 is an apocalyptic number.

66864398 is a deficient number, since it is larger than the sum of its proper divisors (36306802).

66864398 is a wasteful number, since it uses less digits than its factorization.

66864398 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4151.

The product of its digits is 1492992, while the sum is 50.

The square root of 66864398 is about 8177.0653660100. The cubic root of 66864398 is about 405.8806179934.

The spelling of 66864398 in words is "sixty-six million, eight hundred sixty-four thousand, three hundred ninety-eight".