28779387848 has 8 divisors (see below), whose sum is σ = 53961352230. Its totient is φ = 14389693920.

The previous prime is 28779387817. The next prime is 28779387853. The reversal of 28779387848 is 84878397782.

It can be written as a sum of positive squares in only one way, i.e., 27402829444 + 1376558404 = 165538^2 + 37102^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×28779387848² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1798711733 + ... + 1798711748.

Almost surely, 2^28779387848 is an apocalyptic number.

It is an amenable number.

28779387848 is a deficient number, since it is larger than the sum of its proper divisors (25181964382).

28779387848 is a wasteful number, since it uses less digits than its factorization.

28779387848 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3597423487 (or 3597423483 counting only the distinct ones).

The product of its digits is 303464448, while the sum is 71.

The spelling of 28779387848 in words is "twenty-eight billion, seven hundred seventy-nine million, three hundred eighty-seven thousand, eight hundred forty-eight".