66989448 has 24 divisors (see below), whose sum is σ = 181429950. Its totient is φ = 22329792.

The previous prime is 66989443. The next prime is 66989473. The reversal of 66989448 is 84498966.

It can be written as a sum of positive squares in only one way, i.e., 55980324 + 11009124 = 7482^2 + 3318^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is a super-2 number, since 2×66989448² = 8975172286689408, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a junction number, because it is equal to n+sod(n) for n = 66989394 and 66989403.

It is not an unprimeable number, because it can be changed into a prime (66989443) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 465133 + ... + 465276.

Almost surely, 2^66989448 is an apocalyptic number.

It is an amenable number.

66989448 is an abundant number, since it is smaller than the sum of its proper divisors (114440502).

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

66989448 is a wasteful number, since it uses less digits than its factorization.

66989448 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 930421 (or 930414 counting only the distinct ones).

The product of its digits is 2985984, while the sum is 54.

The square root of 66989448 is about 8184.7081805034. The cubic root of 66989448 is about 406.1334868079.

The spelling of 66989448 in words is "sixty-six million, nine hundred eighty-nine thousand, four hundred forty-eight".