66920448 has 112 divisors (see below), whose sum is σ = 204459840. Its totient is φ = 19070976.

The previous prime is 66920443. The next prime is 66920461. The reversal of 66920448 is 84402966.

It is a tau number, because it is divible by the number of its divisors (112).

It is not an unprimeable number, because it can be changed into a prime (66920443) 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, 171838 + ... + 172226.

Almost surely, 2^66920448 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 66920448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (102229920).

66920448 is an abundant number, since it is smaller than the sum of its proper divisors (137539392).

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

66920448 is an equidigital number, since it uses as much as digits as its factorization.

66920448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 425 (or 401 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 39.

The square root of 66920448 is about 8180.4919167493. The cubic root of 66920448 is about 405.9939979861.

The spelling of 66920448 in words is "sixty-six million, nine hundred twenty thousand, four hundred forty-eight".