66483840 has 128 divisors (see below), whose sum is σ = 218949120. Its totient is φ = 17141760.

The previous prime is 66483829. The next prime is 66483841. The reversal of 66483840 is 4838466.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×66483840² = 8840201962291200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66483841) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 58962 + ... + 60078.

It is an arithmetic number, because the mean of its divisors is an integer number (1710540).

Almost surely, 2^66483840 is an apocalyptic number.

66483840 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66483840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (109474560).

66483840 is an abundant number, since it is smaller than the sum of its proper divisors (152465280).

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

66483840 is a wasteful number, since it uses less digits than its factorization.

66483840 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1170 (or 1158 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 39.

The square root of 66483840 is about 8153.7623217751. The cubic root of 66483840 is about 405.1091307801.

It can be divided in two parts, 6 and 6483840, that added together give a palindrome (6483846).

The spelling of 66483840 in words is "sixty-six million, four hundred eighty-three thousand, eight hundred forty".