77189066 has 4 divisors (see below), whose sum is σ = 115783602. Its totient is φ = 38594532.

The previous prime is 77189053. The next prime is 77189069. The reversal of 77189066 is 66098177.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66098177 = 761 ⋅86857.

It can be written as a sum of positive squares in only one way, i.e., 71995225 + 5193841 = 8485^2 + 2279^2 .

It is not an unprimeable number, because it can be changed into a prime (77189069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19297265 + ... + 19297268.

Almost surely, 2^77189066 is an apocalyptic number.

77189066 is a deficient number, since it is larger than the sum of its proper divisors (38594536).

77189066 is a wasteful number, since it uses less digits than its factorization.

77189066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38594535.

The product of its (nonzero) digits is 127008, while the sum is 44.

The square root of 77189066 is about 8785.7308176383. The cubic root of 77189066 is about 425.7800042574.

The spelling of 77189066 in words is "seventy-seven million, one hundred eighty-nine thousand, sixty-six".