66823650 has 48 divisors (see below), whose sum is σ = 184140000. Its totient is φ = 17819280.

The previous prime is 66823639. The next prime is 66823657. The reversal of 66823650 is 5632866.

It is not an unprimeable number, because it can be changed into a prime (66823657) 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 23 ways as a sum of consecutive naturals, for example, 23400 + ... + 26099.

It is an arithmetic number, because the mean of its divisors is an integer number (3836250).

Almost surely, 2^66823650 is an apocalyptic number.

66823650 is an abundant number, since it is smaller than the sum of its proper divisors (117316350).

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

66823650 is a wasteful number, since it uses less digits than its factorization.

66823650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 49520 (or 49509 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 36.

The square root of 66823650 is about 8174.5733833638. The cubic root of 66823650 is about 405.7981516650.

The spelling of 66823650 in words is "sixty-six million, eight hundred twenty-three thousand, six hundred fifty".