66839214 has 32 divisors (see below), whose sum is σ = 145797120. Its totient is φ = 20303712.

The previous prime is 66839209. The next prime is 66839221. The reversal of 66839214 is 41293866.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 739 + ... + 11585.

It is an arithmetic number, because the mean of its divisors is an integer number (4556160).

Almost surely, 2^66839214 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66839214, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (72898560).

66839214 is an abundant number, since it is smaller than the sum of its proper divisors (78957906).

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

66839214 is a wasteful number, since it uses less digits than its factorization.

66839214 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10944.

The product of its digits is 62208, while the sum is 39.

The square root of 66839214 is about 8175.5253042236. The cubic root of 66839214 is about 405.8296542451.

The spelling of 66839214 in words is "sixty-six million, eight hundred thirty-nine thousand, two hundred fourteen".