277777778028 has 12 divisors (see below), whose sum is σ = 648148148760. Its totient is φ = 92592592672.

The previous prime is 277777778023. The next prime is 277777778039. The reversal of 277777778028 is 820877777772.

It is a tau number, because it is divible by the number of its divisors (12).

It is not an unprimeable number, because it can be changed into a prime (277777778023) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11574074073 + ... + 11574074096.

It is an arithmetic number, because the mean of its divisors is an integer number (54012345730).

Almost surely, 2^277777778028 is an apocalyptic number.

It is an amenable number.

277777778028 is an abundant number, since it is smaller than the sum of its proper divisors (370370370732).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

277777778028 is a wasteful number, since it uses less digits than its factorization.

277777778028 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23148148176 (or 23148148174 counting only the distinct ones).

The product of its (nonzero) digits is 210827008, while the sum is 69.

The spelling of 277777778028 in words is "two hundred seventy-seven billion, seven hundred seventy-seven million, seven hundred seventy-eight thousand, twenty-eight".