66923420 has 24 divisors (see below), whose sum is σ = 145074048. Its totient is φ = 25905600.

The previous prime is 66923411. The next prime is 66923447. The reversal of 66923420 is 2432966.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 53351 + ... + 54590.

It is an arithmetic number, because the mean of its divisors is an integer number (6044752).

Almost surely, 2^66923420 is an apocalyptic number.

It is an amenable number.

66923420 is an abundant number, since it is smaller than the sum of its proper divisors (78150628).

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

66923420 is a wasteful number, since it uses less digits than its factorization.

66923420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107981 (or 107979 counting only the distinct ones).

The product of its (nonzero) digits is 15552, while the sum is 32.

The square root of 66923420 is about 8180.6735664003. The cubic root of 66923420 is about 406.0000080888. Note that the first 5 decimals are identical.

The spelling of 66923420 in words is "sixty-six million, nine hundred twenty-three thousand, four hundred twenty".