66783900 has 36 divisors (see below), whose sum is σ = 193228952. Its totient is φ = 17808960.

The previous prime is 66783887. The next prime is 66783901. The reversal of 66783900 is 938766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66783901) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 111007 + ... + 111606.

Almost surely, 2^66783900 is an apocalyptic number.

66783900 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

66783900 is an abundant number, since it is smaller than the sum of its proper divisors (126445052).

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

66783900 is a wasteful number, since it uses less digits than its factorization.

66783900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 222630 (or 222623 counting only the distinct ones).

The product of its (nonzero) digits is 54432, while the sum is 39.

The square root of 66783900 is about 8172.1417021488. The cubic root of 66783900 is about 405.7176727927.

The spelling of 66783900 in words is "sixty-six million, seven hundred eighty-three thousand, nine hundred".