66948920 has 16 divisors (see below), whose sum is σ = 150635160. Its totient is φ = 26779552.

The previous prime is 66948901. The next prime is 66948923. The reversal of 66948920 is 2984966.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66948923) 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 3 ways as a sum of consecutive naturals, for example, 836822 + ... + 836901.

Almost surely, 2^66948920 is an apocalyptic number.

It is an amenable number.

66948920 is an abundant number, since it is smaller than the sum of its proper divisors (83686240).

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

66948920 is a wasteful number, since it uses less digits than its factorization.

66948920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1673734 (or 1673730 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 44.

The square root of 66948920 is about 8182.2319693345. The cubic root of 66948920 is about 406.0515679441.

The spelling of 66948920 in words is "sixty-six million, nine hundred forty-eight thousand, nine hundred twenty".