66780792 has 48 divisors (see below), whose sum is σ = 194780040. Its totient is φ = 20547648.

The previous prime is 66780773. The next prime is 66780793. The reversal of 66780792 is 29708766.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66780793) 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 11 ways as a sum of consecutive naturals, for example, 34738 + ... + 36609.

Almost surely, 2^66780792 is an apocalyptic number.

It is an amenable number.

66780792 is an abundant number, since it is smaller than the sum of its proper divisors (127999248).

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

66780792 is a wasteful number, since it uses less digits than its factorization.

66780792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71372 (or 71365 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 66780792 is about 8171.9515417065. The cubic root of 66780792 is about 405.7113789100.

The spelling of 66780792 in words is "sixty-six million, seven hundred eighty thousand, seven hundred ninety-two".