66694860 has 96 divisors (see below), whose sum is σ = 209522880. Its totient is φ = 17611776.

The previous prime is 66694847. The next prime is 66694861. The reversal of 66694860 is 6849666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a zygodrome in base 3.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66694861) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 60474 + ... + 61566.

It is an arithmetic number, because the mean of its divisors is an integer number (2182530).

Almost surely, 2^66694860 is an apocalyptic number.

66694860 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 66694860, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104761440).

66694860 is an abundant number, since it is smaller than the sum of its proper divisors (142828020).

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

66694860 is a wasteful number, since it uses less digits than its factorization.

66694860 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1224 (or 1216 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 45.

The square root of 66694860 is about 8166.6921088039. The cubic root of 66694860 is about 405.5372841653.

The spelling of 66694860 in words is "sixty-six million, six hundred ninety-four thousand, eight hundred sixty".