66426448 has 40 divisors (see below), whose sum is σ = 142803360. Its totient is φ = 29677440.

The previous prime is 66426431. The next prime is 66426449. The reversal of 66426448 is 84462466.

It is a self number, because there is not a number n which added to its sum of digits gives 66426448.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66426449) 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, 7186 + ... + 13582.

It is an arithmetic number, because the mean of its divisors is an integer number (3570084).

Almost surely, 2^66426448 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 66426448, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (71401680).

66426448 is an abundant number, since it is smaller than the sum of its proper divisors (76376912).

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

66426448 is a wasteful number, since it uses less digits than its factorization.

66426448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6475 (or 6469 counting only the distinct ones).

The product of its digits is 221184, while the sum is 40.

The square root of 66426448 is about 8150.2422049900. The cubic root of 66426448 is about 404.9925274240.

The spelling of 66426448 in words is "sixty-six million, four hundred twenty-six thousand, four hundred forty-eight".