77861066 has 4 divisors (see below), whose sum is σ = 116791602. Its totient is φ = 38930532.

The previous prime is 77861059. The next prime is 77861083. The reversal of 77861066 is 66016877.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 67486225 + 10374841 = 8215^2 + 3221^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19465265 + ... + 19465268.

Almost surely, 2^77861066 is an apocalyptic number.

77861066 is a deficient number, since it is larger than the sum of its proper divisors (38930536).

77861066 is a wasteful number, since it uses less digits than its factorization.

77861066 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 38930535.

The product of its (nonzero) digits is 84672, while the sum is 41.

The square root of 77861066 is about 8823.8917717751. The cubic root of 77861066 is about 427.0120346818.

The spelling of 77861066 in words is "seventy-seven million, eight hundred sixty-one thousand, sixty-six".