66089844 has 90 divisors (see below), whose sum is σ = 178759350. Its totient is φ = 21290688.

The previous prime is 66089819. The next prime is 66089857. The reversal of 66089844 is 44898066.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 22924944 + 43164900 = 4788^2 + 6570^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66089844.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 443482 + ... + 443630.

It is an arithmetic number, because the mean of its divisors is an integer number (1986215).

Almost surely, 2^66089844 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66089844, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (89379675).

66089844 is an abundant number, since it is smaller than the sum of its proper divisors (112669506).

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

66089844 is a wasteful number, since it uses less digits than its factorization.

66089844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239 (or 191 counting only the distinct ones).

The product of its (nonzero) digits is 331776, while the sum is 45.

The square root of 66089844 is about 8129.5660400786. The cubic root of 66089844 is about 404.3072932451.

The spelling of 66089844 in words is "sixty-six million, eighty-nine thousand, eight hundred forty-four".