77777778028 has 24 divisors (see below), whose sum is σ = 136422427232. Its totient is φ = 38800041984.

The previous prime is 77777777989. The next prime is 77777778037. The reversal of 77777778028 is 82087777777.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3341326 + ... + 3364522.

Almost surely, 2^77777778028 is an apocalyptic number.

It is an amenable number.

77777778028 is a deficient number, since it is larger than the sum of its proper divisors (58644649204).

77777778028 is a wasteful number, since it uses less digits than its factorization.

77777778028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25081 (or 25079 counting only the distinct ones).

The product of its (nonzero) digits is 105413504, while the sum is 67.

The spelling of 77777778028 in words is "seventy-seven billion, seven hundred seventy-seven million, seven hundred seventy-eight thousand, twenty-eight".