1171475778 has 48 divisors (see below), whose sum is σ = 2606472288. Its totient is φ = 350697600.

The previous prime is 1171475777. The next prime is 1171475803. The reversal of 1171475778 is 8775741711.

It is not an unprimeable number, because it can be changed into a prime (1171475777) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 50538 + ... + 69978.

It is an arithmetic number, because the mean of its divisors is an integer number (54301506).

Almost surely, 2^1171475778 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1171475778, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1303236144).

1171475778 is an abundant number, since it is smaller than the sum of its proper divisors (1434996510).

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

1171475778 is a wasteful number, since it uses less digits than its factorization.

1171475778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19551 (or 19540 counting only the distinct ones).

The product of its digits is 384160, while the sum is 48.

The square root of 1171475778 is about 34226.8283368471. The cubic root of 1171475778 is about 1054.1710964737.

The spelling of 1171475778 in words is "one billion, one hundred seventy-one million, four hundred seventy-five thousand, seven hundred seventy-eight".