1144781478 has 32 divisors (see below), whose sum is σ = 2547148800. Its totient is φ = 381115368.

The previous prime is 1144781447. The next prime is 1144781489. The reversal of 1144781478 is 8741874411.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 31563 + ... + 57321.

It is an arithmetic number, because the mean of its divisors is an integer number (79598400).

Almost surely, 2^1144781478 is an apocalyptic number.

1144781478 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

1144781478 is an abundant number, since it is smaller than the sum of its proper divisors (1402367322).

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

1144781478 is a wasteful number, since it uses less digits than its factorization.

1144781478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26593 (or 26587 counting only the distinct ones).

The product of its digits is 200704, while the sum is 45.

The square root of 1144781478 is about 33834.6195190666. The cubic root of 1144781478 is about 1046.1023989825.

The spelling of 1144781478 in words is "one billion, one hundred forty-four million, seven hundred eighty-one thousand, four hundred seventy-eight".