66448240 has 40 divisors (see below), whose sum is σ = 163583280. Its totient is φ = 25015296.

The previous prime is 66448231. The next prime is 66448241. The reversal of 66448240 is 4284466.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (40).

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 66448196 and 66448205.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66448241) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 23070 + ... + 25789.

It is an arithmetic number, because the mean of its divisors is an integer number (4089582).

Almost surely, 2^66448240 is an apocalyptic number.

It is an amenable number.

66448240 is an abundant number, since it is smaller than the sum of its proper divisors (97135040).

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

66448240 is a wasteful number, since it uses less digits than its factorization.

66448240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48889 (or 48883 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 34.

The square root of 66448240 is about 8151.5789881470. The cubic root of 66448240 is about 405.0368101481.

It can be divided in two parts, 6644 and 8240, that added together give a square (14884 = 122²).

The spelling of 66448240 in words is "sixty-six million, four hundred forty-eight thousand, two hundred forty".