2778869988 has 36 divisors (see below), whose sum is σ = 7077998928. Its totient is φ = 919217520.

The previous prime is 2778869879. The next prime is 2778869993. The reversal of 2778869988 is 8899688772.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 289906 + ... + 299337.

Almost surely, 2^2778869988 is an apocalyptic number.

It is an amenable number.

2778869988 is an abundant number, since it is smaller than the sum of its proper divisors (4299128940).

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

2778869988 is a wasteful number, since it uses less digits than its factorization.

2778869988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 589384 (or 589379 counting only the distinct ones).

The product of its digits is 195084288, while the sum is 72.

The square root of 2778869988 is about 52714.9882670953. The cubic root of 2778869988 is about 1405.9053258497.

The spelling of 2778869988 in words is "two billion, seven hundred seventy-eight million, eight hundred sixty-nine thousand, nine hundred eighty-eight".