66785424 has 20 divisors (see below), whose sum is σ = 172529136. Its totient is φ = 22261792.

The previous prime is 66785417. The next prime is 66785461. The reversal of 66785424 is 42458766.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 695634 + ... + 695729.

Almost surely, 2^66785424 is an apocalyptic number.

It is an amenable number.

66785424 is an abundant number, since it is smaller than the sum of its proper divisors (105743712).

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

66785424 is a wasteful number, since it uses less digits than its factorization.

66785424 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1391374 (or 1391368 counting only the distinct ones).

The product of its digits is 322560, while the sum is 42.

The square root of 66785424 is about 8172.2349452277. The cubic root of 66785424 is about 405.7207589109.

The spelling of 66785424 in words is "sixty-six million, seven hundred eighty-five thousand, four hundred twenty-four".