66947090 has 16 divisors (see below), whose sum is σ = 137719872. Its totient is φ = 22953264.

The previous prime is 66947081. The next prime is 66947093. The reversal of 66947090 is 9074966.

66947090 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (66947093) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 478124 + ... + 478263.

It is an arithmetic number, because the mean of its divisors is an integer number (8607492).

Almost surely, 2^66947090 is an apocalyptic number.

66947090 is an abundant number, since it is smaller than the sum of its proper divisors (70772782).

66947090 is a wasteful number, since it uses less digits than its factorization.

66947090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 956401.

The product of its (nonzero) digits is 81648, while the sum is 41.

The square root of 66947090 is about 8182.1201408926. The cubic root of 66947090 is about 406.0478682024.

The spelling of 66947090 in words is "sixty-six million, nine hundred forty-seven thousand, ninety".