66919420 has 24 divisors (see below), whose sum is σ = 146641824. Its totient is φ = 25603776.

The previous prime is 66919381. The next prime is 66919423. The reversal of 66919420 is 2491966.

It is a self number, because there is not a number n which added to its sum of digits gives 66919420.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66919423) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 72279 + ... + 73198.

It is an arithmetic number, because the mean of its divisors is an integer number (6110076).

Almost surely, 2^66919420 is an apocalyptic number.

It is an amenable number.

66919420 is an abundant number, since it is smaller than the sum of its proper divisors (79722404).

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

66919420 is a wasteful number, since it uses less digits than its factorization.

66919420 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 145509 (or 145507 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 37.

The square root of 66919420 is about 8180.4290841007. The cubic root of 66919420 is about 405.9919190801.

The spelling of 66919420 in words is "sixty-six million, nine hundred nineteen thousand, four hundred twenty".