66889798 has 8 divisors (see below), whose sum is σ = 106236792. Its totient is φ = 31477536.

The previous prime is 66889793. The next prime is 66889799. The reversal of 66889798 is 89798866.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66889793) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 983640 + ... + 983707.

It is an arithmetic number, because the mean of its divisors is an integer number (13279599).

Almost surely, 2^66889798 is an apocalyptic number.

66889798 is a deficient number, since it is larger than the sum of its proper divisors (39346994).

66889798 is a wasteful number, since it uses less digits than its factorization.

66889798 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1967366.

The product of its digits is 10450944, while the sum is 61.

The square root of 66889798 is about 8178.6183429721. The cubic root of 66889798 is about 405.9320058912.

The spelling of 66889798 in words is "sixty-six million, eight hundred eighty-nine thousand, seven hundred ninety-eight".