66705930 has 96 divisors (see below), whose sum is σ = 182355264. Its totient is φ = 17542656.

The previous prime is 66705923. The next prime is 66705953. The reversal of 66705930 is 3950766.

It is a happy number.

66705930 is a `hidden beast` number, since 6 + 67 + 0 + 593 + 0 = 666.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 235569 + ... + 235851.

It is an arithmetic number, because the mean of its divisors is an integer number (1899534).

Almost surely, 2^66705930 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 66705930, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (91177632).

66705930 is an abundant number, since it is smaller than the sum of its proper divisors (115649334).

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

66705930 is a wasteful number, since it uses less digits than its factorization.

66705930 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 402 (or 390 counting only the distinct ones).

The product of its (nonzero) digits is 34020, while the sum is 36.

The square root of 66705930 is about 8167.3698336735. The cubic root of 66705930 is about 405.5597199242.

The spelling of 66705930 in words is "sixty-six million, seven hundred five thousand, nine hundred thirty".