66441810 has 32 divisors (see below), whose sum is σ = 162078912. Its totient is φ = 17426880.

The previous prime is 66441769. The next prime is 66441811. The reversal of 66441810 is 1814466.

It is a super-2 number, since 2×66441810² = 8829028232152200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is not an unprimeable number, because it can be changed into a prime (66441811) 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, 16324 + ... + 19983.

It is an arithmetic number, because the mean of its divisors is an integer number (5064966).

Almost surely, 2^66441810 is an apocalyptic number.

66441810 is an abundant number, since it is smaller than the sum of its proper divisors (95637102).

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

66441810 is a wasteful number, since it uses less digits than its factorization.

66441810 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36378.

The product of its (nonzero) digits is 4608, while the sum is 30.

The square root of 66441810 is about 8151.1845764895. The cubic root of 66441810 is about 405.0237449879.

The spelling of 66441810 in words is "sixty-six million, four hundred forty-one thousand, eight hundred ten".