77666666 has 24 divisors (see below), whose sum is σ = 147842496. Its totient is φ = 30259320.

The previous prime is 77666657. The next prime is 77666681. The reversal of 77666666 is 66666677.

It is a super-2 number, since 2×77666666² = 12064222015111112, which contains 22 as substring.

77666666 is a modest number, since divided by 66666 gives 776 as remainder.

It is a nialpdrome in base 10.

It is a zygodrome in base 10.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 34946 + ... + 37101.

It is an arithmetic number, because the mean of its divisors is an integer number (6160104).

Almost surely, 2^77666666 is an apocalyptic number.

77666666 is a deficient number, since it is larger than the sum of its proper divisors (70175830).

77666666 is a wasteful number, since it uses less digits than its factorization.

77666666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 72074 (or 72067 counting only the distinct ones).

The product of its digits is 2286144, while the sum is 50.

The square root of 77666666 is about 8812.8693397780. The cubic root of 77666666 is about 426.6563570371.

The spelling of 77666666 in words is "seventy-seven million, six hundred sixty-six thousand, six hundred sixty-six".