1248591778 has 16 divisors (see below), whose sum is σ = 2192649984. Its totient is φ = 522059040.

The previous prime is 1248591749. The next prime is 1248591791. The reversal of 1248591778 is 8771958421.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1087050 + ... + 1088197.

It is an arithmetic number, because the mean of its divisors is an integer number (137040624).

Almost surely, 2^1248591778 is an apocalyptic number.

1248591778 is a deficient number, since it is larger than the sum of its proper divisors (944058206).

1248591778 is a wasteful number, since it uses less digits than its factorization.

1248591778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2175297.

The product of its digits is 1128960, while the sum is 52.

The square root of 1248591778 is about 35335.4181806300. The cubic root of 1248591778 is about 1076.8126700349.

The spelling of 1248591778 in words is "one billion, two hundred forty-eight million, five hundred ninety-one thousand, seven hundred seventy-eight".