66371808 has 96 divisors (see below), whose sum is σ = 187536384. Its totient is φ = 20477952.

The previous prime is 66371803. The next prime is 66371831. The reversal of 66371808 is 80817366.

It is a tau number, because it is divible by the number of its divisors (96).

It is a hoax number, since the sum of its digits (39) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66371801) 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, 109041 + ... + 109647.

It is an arithmetic number, because the mean of its divisors is an integer number (1953504).

Almost surely, 2^66371808 is an apocalyptic number.

66371808 is a gapful number since it is divisible by the number (68) 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 66371808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (93768192).

66371808 is an abundant number, since it is smaller than the sum of its proper divisors (121164576).

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

66371808 is a wasteful number, since it uses less digits than its factorization.

66371808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 704 (or 696 counting only the distinct ones).

The product of its (nonzero) digits is 48384, while the sum is 39.

The square root of 66371808 is about 8146.8894677662. The cubic root of 66371808 is about 404.8814528817.

The spelling of 66371808 in words is "sixty-six million, three hundred seventy-one thousand, eight hundred eight".