66103890 has 64 divisors (see below), whose sum is σ = 163924992. Its totient is φ = 17049600.

The previous prime is 66103889. The next prime is 66103897. The reversal of 66103890 is 9830166.

66103890 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (66103897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 274170 + ... + 274410.

It is an arithmetic number, because the mean of its divisors is an integer number (2561328).

Almost surely, 2^66103890 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66103890, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81962496).

66103890 is an abundant number, since it is smaller than the sum of its proper divisors (97821102).

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

66103890 is a wasteful number, since it uses less digits than its factorization.

66103890 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 515.

The product of its (nonzero) digits is 7776, while the sum is 33.

The square root of 66103890 is about 8130.4298779339. The cubic root of 66103890 is about 404.3359335405.

The spelling of 66103890 in words is "sixty-six million, one hundred three thousand, eight hundred ninety".