66694020 has 96 divisors (see below), whose sum is σ = 201277440. Its totient is φ = 16452480.

The previous prime is 66693973. The next prime is 66694021. The reversal of 66694020 is 2049666.

It is not an unprimeable number, because it can be changed into a prime (66694021) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 42001 + ... + 43559.

It is an arithmetic number, because the mean of its divisors is an integer number (2096640).

Almost surely, 2^66694020 is an apocalyptic number.

66694020 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 66694020, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (100638720).

66694020 is an abundant number, since it is smaller than the sum of its proper divisors (134583420).

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

66694020 is a wasteful number, since it uses less digits than its factorization.

66694020 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1625 (or 1623 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 33.

The square root of 66694020 is about 8166.6406802308. The cubic root of 66694020 is about 405.5355816216.

The spelling of 66694020 in words is "sixty-six million, six hundred ninety-four thousand, twenty".