66778030 has 32 divisors (see below), whose sum is σ = 135364608. Its totient is φ = 23498400.

The previous prime is 66778013. The next prime is 66778031. The reversal of 66778030 is 3087766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66778031) 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 15 ways as a sum of consecutive naturals, for example, 6382 + ... + 13201.

It is an arithmetic number, because the mean of its divisors is an integer number (4230144).

Almost surely, 2^66778030 is an apocalyptic number.

66778030 is an abundant number, since it is smaller than the sum of its proper divisors (68586578).

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

66778030 is a wasteful number, since it uses less digits than its factorization.

66778030 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19632.

The product of its (nonzero) digits is 42336, while the sum is 37.

The square root of 66778030 is about 8171.7825472782. The cubic root of 66778030 is about 405.7057855338.

The spelling of 66778030 in words is "sixty-six million, seven hundred seventy-eight thousand, thirty".