66788998 has 8 divisors (see below), whose sum is σ = 100283040. Its totient is φ = 33361320.

The previous prime is 66788963. The next prime is 66788999. The reversal of 66788998 is 89988766.

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 (66788999) 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, 13993 + ... + 18148.

It is an arithmetic number, because the mean of its divisors is an integer number (12535380).

Almost surely, 2^66788998 is an apocalyptic number.

66788998 is a deficient number, since it is larger than the sum of its proper divisors (33494042).

66788998 is a wasteful number, since it uses less digits than its factorization.

66788998 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33182.

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

The square root of 66788998 is about 8172.4536095349. The cubic root of 66788998 is about 405.7279961195.

The spelling of 66788998 in words is "sixty-six million, seven hundred eighty-eight thousand, nine hundred ninety-eight".