2778607628 has 6 divisors (see below), whose sum is σ = 4862563356. Its totient is φ = 1389303812.

The previous prime is 2778607613. The next prime is 2778607639. The reversal of 2778607628 is 8267068772.

It is a self number, because there is not a number n which added to its sum of digits gives 2778607628.

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 as a sum of consecutive naturals, namely, 347325950 + ... + 347325957.

It is an arithmetic number, because the mean of its divisors is an integer number (810427226).

Almost surely, 2^2778607628 is an apocalyptic number.

It is an amenable number.

2778607628 is a deficient number, since it is larger than the sum of its proper divisors (2083955728).

2778607628 is a wasteful number, since it uses less digits than its factorization.

2778607628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 694651911 (or 694651909 counting only the distinct ones).

The product of its (nonzero) digits is 3161088, while the sum is 53.

The square root of 2778607628 is about 52712.4997320370. The cubic root of 2778607628 is about 1405.8610794556.

The spelling of 2778607628 in words is "two billion, seven hundred seventy-eight million, six hundred seven thousand, six hundred twenty-eight".